Upozornění, Hodiny a Varování NOAA SWPC
National Oceanic and Atmospheric Administration Space Weather Foreiction Center (NOAA SWPC) je oficiální vládní agentura pro vesmírné počasí ze Spojených států, která poskytuje výstrahy, časy a varování před rušivým vesmírním počasím. Níže naleznete nejnovější výstrahy, časy a varování vydané vesmírným počasím vydané SWPC NOAA.
čtvrtek 24. dubna 2025
17:16 UTC
Space Weather Message Code: WARK04
Serial Number: 4939
Issue Time: 2025 Apr 24 1716 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4938
Valid From: 2025 Apr 24 0655 UTC
Now Valid Until: 2025 Apr 25 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
11:36 UTC
Space Weather Message Code: WARK04
Serial Number: 4938
Issue Time: 2025 Apr 24 1136 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4937
Valid From: 2025 Apr 24 0655 UTC
Now Valid Until: 2025 Apr 24 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:09 UTC
Space Weather Message Code: ALTK04
Serial Number: 2552
Issue Time: 2025 Apr 24 0709 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 24 0703 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
06:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4937
Issue Time: 2025 Apr 24 0656 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 24 0655 UTC
Valid To: 2025 Apr 24 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
pondělí 21. dubna 2025
23:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4936
Issue Time: 2025 Apr 21 2356 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4935
Valid From: 2025 Apr 21 0218 UTC
Now Valid Until: 2025 Apr 22 1159 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:34 UTC
Space Weather Message Code: ALTK05
Serial Number: 1756
Issue Time: 2025 Apr 21 2034 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 2033 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
13:54 UTC
Space Weather Message Code: WARK06
Serial Number: 577
Issue Time: 2025 Apr 21 1354 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 21 1353 UTC
Valid To: 2025 Apr 21 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
13:54 UTC
Space Weather Message Code: ALTK05
Serial Number: 1755
Issue Time: 2025 Apr 21 1354 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 1352 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
11:46 UTC
Space Weather Message Code: ALTK05
Serial Number: 1754
Issue Time: 2025 Apr 21 1146 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 1142 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
10:10 UTC
Space Weather Message Code: WARK05
Serial Number: 2026
Issue Time: 2025 Apr 21 1010 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 21 1010 UTC
Valid To: 2025 Apr 21 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
09:34 UTC
Space Weather Message Code: WARK04
Serial Number: 4935
Issue Time: 2025 Apr 21 0934 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4934
Valid From: 2025 Apr 21 0218 UTC
Now Valid Until: 2025 Apr 21 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:25 UTC
Space Weather Message Code: ALTK04
Serial Number: 2551
Issue Time: 2025 Apr 21 0225 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 21 0224 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:18 UTC
Space Weather Message Code: WARK04
Serial Number: 4934
Issue Time: 2025 Apr 21 0218 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 21 0218 UTC
Valid To: 2025 Apr 21 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:48 UTC
Space Weather Message Code: WATA30
Serial Number: 251
Issue Time: 2025 Apr 21 0148 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 21: None (Below G1) Apr 22: G2 (Moderate) Apr 23: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
neděle 20. dubna 2025
00:56 UTC
Space Weather Message Code: ALTK05
Serial Number: 1753
Issue Time: 2025 Apr 20 0056 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 20 0055 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
00:41 UTC
Space Weather Message Code: ALTK04
Serial Number: 2550
Issue Time: 2025 Apr 20 0041 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 20 0038 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:38 UTC
Space Weather Message Code: WARK05
Serial Number: 2025
Issue Time: 2025 Apr 20 0038 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 20 0038 UTC
Valid To: 2025 Apr 20 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
00:06 UTC
Space Weather Message Code: WARK04
Serial Number: 4933
Issue Time: 2025 Apr 20 0006 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 20 0005 UTC
Valid To: 2025 Apr 20 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
sobota 19. dubna 2025
20:47 UTC
Space Weather Message Code: WATA30
Serial Number: 250
Issue Time: 2025 Apr 19 2047 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 20: None (Below G1) Apr 21: None (Below G1) Apr 22: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
14:55 UTC
Space Weather Message Code: WARK04
Serial Number: 4932
Issue Time: 2025 Apr 19 1455 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4931
Valid From: 2025 Apr 19 0218 UTC
Now Valid Until: 2025 Apr 19 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:27 UTC
Space Weather Message Code: ALTK04
Serial Number: 2549
Issue Time: 2025 Apr 19 0227 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 19 0227 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:19 UTC
Space Weather Message Code: WARK04
Serial Number: 4931
Issue Time: 2025 Apr 19 0219 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 19 0218 UTC
Valid To: 2025 Apr 19 1500 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:07 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1411
Issue Time: 2025 Apr 19 0007 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Apr 18 2345 UTC
Estimated Velocity: 349 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
pátek 18. dubna 2025
04:48 UTC
Space Weather Message Code: WARK05
Serial Number: 2024
Issue Time: 2025 Apr 18 0448 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 18 0447 UTC
Valid To: 2025 Apr 18 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:02 UTC
Space Weather Message Code: ALTK04
Serial Number: 2548
Issue Time: 2025 Apr 18 0402 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 18 0357 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:52 UTC
Space Weather Message Code: WARK04
Serial Number: 4930
Issue Time: 2025 Apr 18 0152 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 18 0152 UTC
Valid To: 2025 Apr 18 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
čtvrtek 17. dubna 2025
10:12 UTC
Space Weather Message Code: WARK04
Serial Number: 4929
Issue Time: 2025 Apr 17 1012 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4928
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
středa 16. dubna 2025
23:13 UTC
Space Weather Message Code: WARK06
Serial Number: 576
Issue Time: 2025 Apr 16 2313 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 575
Valid From: 2025 Apr 16 1315 UTC
Now Valid Until: 2025 Apr 17 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:13 UTC
Space Weather Message Code: WARK05
Serial Number: 2023
Issue Time: 2025 Apr 16 2313 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2022
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 17 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
21:40 UTC
Space Weather Message Code: ALTK05
Serial Number: 1752
Issue Time: 2025 Apr 16 2140 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 2136 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:54 UTC
Space Weather Message Code: ALTK08
Serial Number: 50
Issue Time: 2025 Apr 16 2054 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2025 Apr 16 2055 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
19:32 UTC
Space Weather Message Code: ALTK07
Serial Number: 182
Issue Time: 2025 Apr 16 1932 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Apr 16 1925 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
19:31 UTC
Space Weather Message Code: WARK07
Serial Number: 125
Issue Time: 2025 Apr 16 1931 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Apr 16 1930 UTC
Valid To: 2025 Apr 17 0000 UTC
Warning Condition: Persistence
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
18:53 UTC
Space Weather Message Code: WARK04
Serial Number: 4928
Issue Time: 2025 Apr 16 1853 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4927
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
18:52 UTC
Space Weather Message Code: WARK05
Serial Number: 2022
Issue Time: 2025 Apr 16 1852 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2021
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 17 0300 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
18:52 UTC
Space Weather Message Code: WARK06
Serial Number: 575
Issue Time: 2025 Apr 16 1852 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 574
Valid From: 2025 Apr 16 1315 UTC
Now Valid Until: 2025 Apr 17 0000 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
18:45 UTC
Space Weather Message Code: ALTK06
Serial Number: 628
Issue Time: 2025 Apr 16 1845 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1838 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
18:32 UTC
Space Weather Message Code: ALTK05
Serial Number: 1751
Issue Time: 2025 Apr 16 1832 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1828 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:44 UTC
Space Weather Message Code: ALTK06
Serial Number: 627
Issue Time: 2025 Apr 16 1644 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1634 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
15:26 UTC
Space Weather Message Code: ALTK05
Serial Number: 1750
Issue Time: 2025 Apr 16 1526 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1520 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:24 UTC
Space Weather Message Code: ALTK07
Serial Number: 181
Issue Time: 2025 Apr 16 1424 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025 Apr 16 1418 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
13:25 UTC
Space Weather Message Code: WARK07
Serial Number: 124
Issue Time: 2025 Apr 16 1325 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Apr 16 1325 UTC
Valid To: 2025 Apr 16 1800 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
13:24 UTC
Space Weather Message Code: ALTK06
Serial Number: 626
Issue Time: 2025 Apr 16 1324 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1321 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
13:13 UTC
Space Weather Message Code: ALTK05
Serial Number: 1749
Issue Time: 2025 Apr 16 1313 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1313 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
13:07 UTC
Space Weather Message Code: WARK06
Serial Number: 574
Issue Time: 2025 Apr 16 1307 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 16 1315 UTC
Valid To: 2025 Apr 16 2100 UTC
Warning Condition: Persistence
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
12:39 UTC
Space Weather Message Code: WARK04
Serial Number: 4927
Issue Time: 2025 Apr 16 1239 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4926
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 0000 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
12:38 UTC
Space Weather Message Code: WARK05
Serial Number: 2021
Issue Time: 2025 Apr 16 1238 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2020
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 16 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
12:00 UTC
Space Weather Message Code: ALTK05
Serial Number: 1748
Issue Time: 2025 Apr 16 1200 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1159 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:35 UTC
Space Weather Message Code: WARK05
Serial Number: 2020
Issue Time: 2025 Apr 16 0535 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2019
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 16 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:35 UTC
Space Weather Message Code: WARK04
Serial Number: 4926
Issue Time: 2025 Apr 16 0535 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4925
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 16 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:34 UTC
Space Weather Message Code: ALTK05
Serial Number: 1747
Issue Time: 2025 Apr 16 0134 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 0130 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
úterý 15. dubna 2025
22:29 UTC
Space Weather Message Code: ALTK06
Serial Number: 625
Issue Time: 2025 Apr 15 2229 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 15 2223 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
22:04 UTC
Space Weather Message Code: ALTK05
Serial Number: 1746
Issue Time: 2025 Apr 15 2204 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 2200 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
21:13 UTC
Space Weather Message Code: SUMSUD
Serial Number: 286
Issue Time: 2025 Apr 15 2113 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Apr 15 1859 UTC
Deviation: 68 nT
Station: BOU
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
19:52 UTC
Space Weather Message Code: ALTK06
Serial Number: 624
Issue Time: 2025 Apr 15 1952 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 15 1944 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
18:59 UTC
Space Weather Message Code: ALTK05
Serial Number: 1745
Issue Time: 2025 Apr 15 1859 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 1859 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
18:50 UTC
Space Weather Message Code: WARK06
Serial Number: 573
Issue Time: 2025 Apr 15 1850 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 15 1900 UTC
Valid To: 2025 Apr 16 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
17:32 UTC
Space Weather Message Code: ALTK05
Serial Number: 1744
Issue Time: 2025 Apr 15 1732 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 1732 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:31 UTC
Space Weather Message Code: WARK05
Serial Number: 2019
Issue Time: 2025 Apr 15 1731 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 15 1730 UTC
Valid To: 2025 Apr 16 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:29 UTC
Space Weather Message Code: ALTK04
Serial Number: 2547
Issue Time: 2025 Apr 15 1729 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 15 1725 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:07 UTC
Space Weather Message Code: WARK04
Serial Number: 4925
Issue Time: 2025 Apr 15 1707 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 15 1705 UTC
Valid To: 2025 Apr 16 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:51 UTC
Space Weather Message Code: WARSUD
Serial Number: 242
Issue Time: 2025 Apr 15 1651 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2025 Apr 15 1729 UTC
Valid To: 2025 Apr 15 1759 UTC
IP Shock Passage Observed: 2025 Apr 15 1642 UTC
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
15:24 UTC
Space Weather Message Code: WATA50
Serial Number: 86
Issue Time: 2025 Apr 15 1524 UTC
WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day:
Apr 16: G3 (Strong) Apr 17: G1 (Minor) Apr 18: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
11:16 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3454
Issue Time: 2025 Apr 15 1116 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3453
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 1464 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
pondělí 14. dubna 2025
23:02 UTC
Space Weather Message Code: ALTK04
Serial Number: 2546
Issue Time: 2025 Apr 14 2302 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 14 2301 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
23:01 UTC
Space Weather Message Code: WARK04
Serial Number: 4924
Issue Time: 2025 Apr 14 2301 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 14 2300 UTC
Valid To: 2025 Apr 15 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4923
Issue Time: 2025 Apr 14 0856 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4922
Valid From: 2025 Apr 14 0031 UTC
Now Valid Until: 2025 Apr 14 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:12 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3453
Issue Time: 2025 Apr 14 0512 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3452
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 1150 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
04:41 UTC
Space Weather Message Code: WARK05
Serial Number: 2018
Issue Time: 2025 Apr 14 0441 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 14 0441 UTC
Valid To: 2025 Apr 14 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:39 UTC
Space Weather Message Code: ALTK04
Serial Number: 2545
Issue Time: 2025 Apr 14 0439 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 14 0429 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:33 UTC
Space Weather Message Code: WARK04
Serial Number: 4922
Issue Time: 2025 Apr 14 0033 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 14 0031 UTC
Valid To: 2025 Apr 14 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
neděle 13. dubna 2025
21:20 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3452
Issue Time: 2025 Apr 13 2120 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3451
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 2657 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
20:07 UTC
Space Weather Message Code: WATA30
Serial Number: 249
Issue Time: 2025 Apr 13 2007 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 14: None (Below G1) Apr 15: None (Below G1) Apr 16: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
08:19 UTC
Space Weather Message Code: WARK04
Serial Number: 4921
Issue Time: 2025 Apr 13 0819 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4920
Valid From: 2025 Apr 12 1636 UTC
Now Valid Until: 2025 Apr 13 2359 UTC
Warning Condition: persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
sobota 12. dubna 2025
22:45 UTC
Space Weather Message Code: WARK04
Serial Number: 4920
Issue Time: 2025 Apr 12 2245 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4919
Valid From: 2025 Apr 12 1636 UTC
Now Valid Until: 2025 Apr 13 0900 UTC
Warning Condition: persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
22:20 UTC
Space Weather Message Code: WARK05
Serial Number: 2017
Issue Time: 2025 Apr 12 2220 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 12 2220 UTC
Valid To: 2025 Apr 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:46 UTC
Space Weather Message Code: ALTK04
Serial Number: 2544
Issue Time: 2025 Apr 12 1746 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 12 1746 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:36 UTC
Space Weather Message Code: WARK04
Serial Number: 4919
Issue Time: 2025 Apr 12 1636 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 12 1636 UTC
Valid To: 2025 Apr 13 0300 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:03 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3451
Issue Time: 2025 Apr 12 0703 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3450
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3362 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
pátek 11. dubna 2025
23:41 UTC
Space Weather Message Code: WARK04
Serial Number: 4918
Issue Time: 2025 Apr 11 2341 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4917
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 12 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:55 UTC
Space Weather Message Code: WARK04
Serial Number: 4917
Issue Time: 2025 Apr 11 1755 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4916
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 11 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
14:08 UTC
Space Weather Message Code: WATA20
Serial Number: 1036
Issue Time: 2025 Apr 11 1408 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 12: G1 (Minor) Apr 13: None (Below G1) Apr 14: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:34 UTC
Space Weather Message Code: WARK04
Serial Number: 4916
Issue Time: 2025 Apr 11 0534 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4915
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 11 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3450
Issue Time: 2025 Apr 11 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3449
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3362 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
čtvrtek 10. dubna 2025
22:59 UTC
Space Weather Message Code: WARK05
Serial Number: 2016
Issue Time: 2025 Apr 10 2259 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 10 2300 UTC
Valid To: 2025 Apr 11 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
22:46 UTC
Space Weather Message Code: ALTK04
Serial Number: 2543
Issue Time: 2025 Apr 10 2246 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 10 2247 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
22:42 UTC
Space Weather Message Code: WARK04
Serial Number: 4915
Issue Time: 2025 Apr 10 2242 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 10 2243 UTC
Valid To: 2025 Apr 11 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:33 UTC
Space Weather Message Code: WARK04
Serial Number: 4914
Issue Time: 2025 Apr 10 0833 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4913
Valid From: 2025 Apr 10 0107 UTC
Now Valid Until: 2025 Apr 10 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:56 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3449
Issue Time: 2025 Apr 10 0756 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3448
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3893 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:41 UTC
Space Weather Message Code: ALTK04
Serial Number: 2542
Issue Time: 2025 Apr 10 0141 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 10 0141 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:08 UTC
Space Weather Message Code: WARK04
Serial Number: 4913
Issue Time: 2025 Apr 10 0108 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 10 0107 UTC
Valid To: 2025 Apr 10 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
středa 9. dubna 2025
08:39 UTC
Space Weather Message Code: WARK04
Serial Number: 4912
Issue Time: 2025 Apr 09 0839 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4911
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 09 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:38 UTC
Space Weather Message Code: WARK05
Serial Number: 2015
Issue Time: 2025 Apr 09 0838 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2014
Valid From: 2025 Apr 08 1436 UTC
Now Valid Until: 2025 Apr 09 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:21 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3448
Issue Time: 2025 Apr 09 0521 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3447
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 10269 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:51 UTC
Space Weather Message Code: ALTK05
Serial Number: 1743
Issue Time: 2025 Apr 09 0151 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 09 0145 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
úterý 8. dubna 2025
20:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2014
Issue Time: 2025 Apr 08 2056 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2013
Valid From: 2025 Apr 08 1436 UTC
Now Valid Until: 2025 Apr 09 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4911
Issue Time: 2025 Apr 08 2056 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4910
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 09 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
15:01 UTC
Space Weather Message Code: ALTK05
Serial Number: 1742
Issue Time: 2025 Apr 08 1501 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 08 1459 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:41 UTC
Space Weather Message Code: WARK04
Serial Number: 4910
Issue Time: 2025 Apr 08 1441 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4909
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 08 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
14:36 UTC
Space Weather Message Code: WARK05
Serial Number: 2013
Issue Time: 2025 Apr 08 1436 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 08 1436 UTC
Valid To: 2025 Apr 08 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
06:14 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1410
Issue Time: 2025 Apr 08 0614 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Apr 08 0553 UTC
Estimated Velocity: 456 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
05:02 UTC
Space Weather Message Code: WARK04
Serial Number: 4909
Issue Time: 2025 Apr 08 0502 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4908
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 08 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3447
Issue Time: 2025 Apr 08 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3446
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 17878 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
pondělí 7. dubna 2025
20:39 UTC
Space Weather Message Code: ALTK04
Serial Number: 2541
Issue Time: 2025 Apr 07 2039 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 07 2039 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
20:22 UTC
Space Weather Message Code: WARK04
Serial Number: 4908
Issue Time: 2025 Apr 07 2022 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 07 2022 UTC
Valid To: 2025 Apr 08 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3446
Issue Time: 2025 Apr 07 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3445
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 9243 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
neděle 6. dubna 2025
23:58 UTC
Space Weather Message Code: WARK04
Serial Number: 4907
Issue Time: 2025 Apr 06 2358 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4906
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 07 0559 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:55 UTC
Space Weather Message Code: WARK04
Serial Number: 4906
Issue Time: 2025 Apr 06 0555 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4905
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 06 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:01 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3445
Issue Time: 2025 Apr 06 0501 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3444
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 2350 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:55 UTC
Space Weather Message Code: WARK05
Serial Number: 2012
Issue Time: 2025 Apr 06 0155 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2011
Valid From: 2025 Apr 05 2005 UTC
Now Valid Until: 2025 Apr 06 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:52 UTC
Space Weather Message Code: ALTK05
Serial Number: 1741
Issue Time: 2025 Apr 06 0152 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 06 0150 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
sobota 5. dubna 2025
20:33 UTC
Space Weather Message Code: WARK06
Serial Number: 572
Issue Time: 2025 Apr 05 2033 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 05 2032 UTC
Valid To: 2025 Apr 06 0300 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:20 UTC
Space Weather Message Code: ALTK05
Serial Number: 1740
Issue Time: 2025 Apr 05 2020 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 2020 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:06 UTC
Space Weather Message Code: WARK05
Serial Number: 2011
Issue Time: 2025 Apr 05 2006 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 05 2005 UTC
Valid To: 2025 Apr 06 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4905
Issue Time: 2025 Apr 05 1756 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4904
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 06 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
12:44 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3444
Issue Time: 2025 Apr 05 1244 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Apr 05 1225 UTC
Station: GOES16
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
04:05 UTC
Space Weather Message Code: ALTK05
Serial Number: 1739
Issue Time: 2025 Apr 05 0405 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 0405 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
03:00 UTC
Space Weather Message Code: ALTK06
Serial Number: 623
Issue Time: 2025 Apr 05 0300 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 05 0259 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
02:11 UTC
Space Weather Message Code: WARK06
Serial Number: 571
Issue Time: 2025 Apr 05 0211 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 05 0210 UTC
Valid To: 2025 Apr 05 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
00:51 UTC
Space Weather Message Code: ALTK05
Serial Number: 1738
Issue Time: 2025 Apr 05 0051 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 0051 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
00:49 UTC
Space Weather Message Code: WARK05
Serial Number: 2010
Issue Time: 2025 Apr 05 0049 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 05 0050 UTC
Valid To: 2025 Apr 05 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
00:47 UTC
Space Weather Message Code: WARK04
Serial Number: 4904
Issue Time: 2025 Apr 05 0047 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4903
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 05 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
pátek 4. dubna 2025
23:19 UTC
Space Weather Message Code: ALTK05
Serial Number: 1737
Issue Time: 2025 Apr 04 2319 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 04 2317 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:20 UTC
Space Weather Message Code: WARK05
Serial Number: 2009
Issue Time: 2025 Apr 04 1420 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2008
Valid From: 2025 Apr 03 1943 UTC
Now Valid Until: 2025 Apr 04 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:20 UTC
Space Weather Message Code: WARK06
Serial Number: 570
Issue Time: 2025 Apr 04 1420 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 04 1418 UTC
Valid To: 2025 Apr 04 2100 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
14:20 UTC
Space Weather Message Code: WARK04
Serial Number: 4903
Issue Time: 2025 Apr 04 1420 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4902
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 05 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
13:07 UTC
Space Weather Message Code: ALTK05
Serial Number: 1736
Issue Time: 2025 Apr 04 1307 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 04 1307 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:49 UTC
Space Weather Message Code: WARK05
Serial Number: 2008
Issue Time: 2025 Apr 04 0549 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2007
Valid From: 2025 Apr 03 1943 UTC
Now Valid Until: 2025 Apr 04 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:48 UTC
Space Weather Message Code: WARK04
Serial Number: 4902
Issue Time: 2025 Apr 04 0548 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4901
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 04 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:01 UTC
Space Weather Message Code: ALTK05
Serial Number: 1735
Issue Time: 2025 Apr 04 0001 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 03 2359 UTC
Synoptic Period: 2100-0000 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
čtvrtek 3. dubna 2025
20:02 UTC
Space Weather Message Code: ALTK05
Serial Number: 1734
Issue Time: 2025 Apr 03 2002 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 03 2002 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:43 UTC
Space Weather Message Code: WARK05
Serial Number: 2007
Issue Time: 2025 Apr 03 1943 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 03 1943 UTC
Valid To: 2025 Apr 04 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:56 UTC
Space Weather Message Code: WARK04
Serial Number: 4901
Issue Time: 2025 Apr 03 1756 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4900
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 04 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:55 UTC
Space Weather Message Code: WARK04
Serial Number: 4900
Issue Time: 2025 Apr 03 1755 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4899
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
09:05 UTC
Space Weather Message Code: WARK04
Serial Number: 4899
Issue Time: 2025 Apr 03 0905 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4898
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
středa 2. dubna 2025
21:12 UTC
Space Weather Message Code: WATA20
Serial Number: 1035
Issue Time: 2025 Apr 02 2112 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 03: None (Below G1) Apr 04: G1 (Minor) Apr 05: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:59 UTC
Space Weather Message Code: WARK04
Serial Number: 4898
Issue Time: 2025 Apr 02 2059 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4897
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 1000 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
18:24 UTC
Space Weather Message Code: SUMPX1
Serial Number: 122
Issue Time: 2025 Apr 02 1824 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Mar 31 1105 UTC
Maximum Time: 2025 Apr 01 0425 UTC
End Time: 2025 Apr 02 0910 UTC
Maximum 10MeV Flux: 147 pfu
NOAA Scale: S2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
11:02 UTC
Space Weather Message Code: WARPX1
Serial Number: 600
Issue Time: 2025 Apr 02 1102 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 599
Valid From: 2025 Mar 31 1057 UTC
Now Valid Until: 2025 Apr 02 1800 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
08:51 UTC
Space Weather Message Code: WARK05
Serial Number: 2006
Issue Time: 2025 Apr 02 0851 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2005
Valid From: 2025 Apr 02 0233 UTC
Now Valid Until: 2025 Apr 02 1500 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:51 UTC
Space Weather Message Code: WARK04
Serial Number: 4897
Issue Time: 2025 Apr 02 0851 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4896
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 02 2100 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:34 UTC
Space Weather Message Code: WARK04
Serial Number: 4896
Issue Time: 2025 Apr 02 0234 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4895
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 02 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:34 UTC
Space Weather Message Code: WARK05
Serial Number: 2005
Issue Time: 2025 Apr 02 0234 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 02 0233 UTC
Valid To: 2025 Apr 02 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:33 UTC
Space Weather Message Code: ALTK04
Serial Number: 2540
Issue Time: 2025 Apr 02 0133 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 02 0132 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:23 UTC
Space Weather Message Code: WARK04
Serial Number: 4895
Issue Time: 2025 Apr 02 0123 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 02 0123 UTC
Valid To: 2025 Apr 02 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:23 UTC
Space Weather Message Code: WATA20
Serial Number: 1034
Issue Time: 2025 Apr 02 0023 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 02: None (Below G1) Apr 03: None (Below G1) Apr 04: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
úterý 1. dubna 2025
23:37 UTC
Space Weather Message Code: WARPX1
Serial Number: 599
Issue Time: 2025 Apr 01 2337 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 598
Valid From: 2025 Mar 31 1057 UTC
Now Valid Until: 2025 Apr 02 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
18:15 UTC
Space Weather Message Code: SUMPX2
Serial Number: 56
Issue Time: 2025 Apr 01 1815 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2025 Apr 01 0205 UTC
Maximum Time: 2025 Apr 01 0425 UTC
End Time: 2025 Apr 01 0910 UTC
Maximum 10MeV Flux: 147 pfu
NOAA Scale: S2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
10:12 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3443
Issue Time: 2025 Apr 01 1012 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3442
Begin Time: 2025 Mar 28 1410 UTC
Yesterday Maximum 2MeV Flux: 2039 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
07:14 UTC
Space Weather Message Code: SUM10R
Serial Number: 863
Issue Time: 2025 Apr 01 0714 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Apr 01 0645 UTC
Maximum Time: 2025 Apr 01 0645 UTC
End Time: 2025 Apr 01 0645 UTC
Duration: 1 minutes
Peak Flux: 190 sfu
Latest Penticton Noon Flux: 172 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
07:05 UTC
Space Weather Message Code: SUMXM5
Serial Number: 287
Issue Time: 2025 Apr 01 0704 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Apr 01 0637 UTC
Maximum Time: 2025 Apr 01 0646 UTC
End Time: 2025 Apr 01 0653 UTC
X-ray Class: M5.6
Optical Class: na
Location: N10E25
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
06:51 UTC
Space Weather Message Code: ALTXMF
Serial Number: 478
Issue Time: 2025 Apr 01 0651 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Apr 01 0645 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
02:22 UTC
Space Weather Message Code: ALTPX2
Serial Number: 77
Issue Time: 2025 Apr 01 0222 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2025 Apr 01 0205 UTC
NOAA Scale: S2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.
pondělí 31. března 2025
23:54 UTC
Space Weather Message Code: WARPX1
Serial Number: 598
Issue Time: 2025 Mar 31 2354 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 597
Valid From: 2025 Mar 31 1057 UTC
Now Valid Until: 2025 Apr 01 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
11:21 UTC
Space Weather Message Code: ALTPX1
Serial Number: 357
Issue Time: 2025 Mar 31 1121 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Mar 31 1105 UTC
NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
10:58 UTC
Space Weather Message Code: WARPX1
Serial Number: 597
Issue Time: 2025 Mar 31 1058 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Mar 31 1057 UTC
Valid To: 2025 Mar 31 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.
05:02 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3442
Issue Time: 2025 Mar 31 0502 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3441
Begin Time: 2025 Mar 28 1410 UTC
Yesterday Maximum 2MeV Flux: 2772 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
neděle 30. března 2025
05:01 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3441
Issue Time: 2025 Mar 30 0501 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3440
Begin Time: 2025 Mar 28 1410 UTC
Yesterday Maximum 2MeV Flux: 2968 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
sobota 29. března 2025
05:07 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3440
Issue Time: 2025 Mar 29 0507 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3439
Begin Time: 2025 Mar 28 1410 UTC
Yesterday Maximum 2MeV Flux: 2819 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
pátek 28. března 2025
23:57 UTC
Space Weather Message Code: WARK04
Serial Number: 4894
Issue Time: 2025 Mar 28 2357 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4893
Valid From: 2025 Mar 25 2017 UTC
Now Valid Until: 2025 Mar 29 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:09 UTC
Space Weather Message Code: SUMX01
Serial Number: 191
Issue Time: 2025 Mar 28 1609 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Mar 28 1503 UTC
Maximum Time: 2025 Mar 28 1521 UTC
End Time: 2025 Mar 28 1542 UTC
X-ray Class: X1.1
Location: N06E75
NOAA Scale: R3 - Strong
Comment: This summary is resent to correct the X-ray Class of this event to an X1.1 vs an X1.4.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
15:50 UTC
Space Weather Message Code: SUMX01
Serial Number: 190
Issue Time: 2025 Mar 28 1550 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Mar 28 1503 UTC
Maximum Time: 2025 Mar 28 1521 UTC
End Time: 2025 Mar 28 1542 UTC
X-ray Class: X1.4
Location: N06E75
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
15:42 UTC
Space Weather Message Code: SUM10R
Serial Number: 862
Issue Time: 2025 Mar 28 1542 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Feb 28 1506 UTC
Maximum Time: 2025 Feb 28 1514 UTC
End Time: 2025 Feb 28 1530 UTC
Duration: 24 minutes
Peak Flux: 380 sfu
Latest Penticton Noon Flux: 153 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
15:37 UTC
Space Weather Message Code: ALTTP4
Serial Number: 679
Issue Time: 2025 Mar 28 1537 UTC
ALERT: Type IV Radio Emission
Begin Time: 2025 Mar 28 1514 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
15:18 UTC
Space Weather Message Code: ALTXMF
Serial Number: 477
Issue Time: 2025 Mar 28 1518 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Mar 28 1507 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
14:28 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3439
Issue Time: 2025 Mar 28 1428 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 28 1410 UTC
Station: GOES16
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
08:23 UTC
Space Weather Message Code: WARK04
Serial Number: 4893
Issue Time: 2025 Mar 28 0823 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4892
Valid From: 2025 Mar 25 2017 UTC
Now Valid Until: 2025 Mar 28 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
čtvrtek 27. března 2025
16:53 UTC
Space Weather Message Code: WARK04
Serial Number: 4892
Issue Time: 2025 Mar 27 1653 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4891
Valid From: 2025 Mar 25 2017 UTC
Now Valid Until: 2025 Mar 28 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:47 UTC
Space Weather Message Code: WARK05
Serial Number: 2004
Issue Time: 2025 Mar 27 1647 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2003
Valid From: 2025 Mar 26 0131 UTC
Now Valid Until: 2025 Mar 28 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:08 UTC
Space Weather Message Code: ALTK05
Serial Number: 1733
Issue Time: 2025 Mar 27 1608 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 27 1605 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
15:03 UTC
Space Weather Message Code: ALTK05
Serial Number: 1732
Issue Time: 2025 Mar 27 1503 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 27 1459 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
09:02 UTC
Space Weather Message Code: ALTK05
Serial Number: 1731
Issue Time: 2025 Mar 27 0902 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 27 0859 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:57 UTC
Space Weather Message Code: ALTK05
Serial Number: 1730
Issue Time: 2025 Mar 27 0557 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 27 0551 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:52 UTC
Space Weather Message Code: WARK05
Serial Number: 2003
Issue Time: 2025 Mar 27 0452 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2002
Valid From: 2025 Mar 26 0131 UTC
Now Valid Until: 2025 Mar 27 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
03:50 UTC
Space Weather Message Code: WARK04
Serial Number: 4891
Issue Time: 2025 Mar 27 0350 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4890
Valid From: 2025 Mar 25 2017 UTC
Now Valid Until: 2025 Mar 27 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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Fakta o počasí ve vesmíru
| Poslední X-záblesk | 28. 03. 2025 | X1.1 |
| Poslední M-záblesk | 22. 04. 2025 | M1.3 |
| Poslední geomagnetická bouře | 21. 04. 2025 | Kp5+ (G1) |
| Dny bez skvrn | |
|---|---|
| Poslední den bez skvrn | 08. 06. 2022 |
| Průměrný měsíční počet slunečních skvrn | |
|---|---|
| března 2025 | 134.2 -20.4 |
| dubna 2025 | 122.8 -11.4 |
| Posledních 30 dnů | 119.6 -11.6 |