NOAA SWPC Alerts, Watches and Warnings

The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.

Tuesday, 25 March 2025

12:50 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1408
Issue Time: 2025 Mar 25 1250 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Mar 25 1236 UTC
Estimated Velocity: 516 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.

03:20 UTC

Space Weather Message Code: WARK04
Serial Number: 4887
Issue Time: 2025 Mar 25 0320 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 25 0330 UTC
Valid To: 2025 Mar 25 1530 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.

Monday, 24 March 2025

11:07 UTC

Space Weather Message Code: WATA30
Serial Number: 247
Issue Time: 2025 Mar 24 1107 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Mar 24: G1 (Minor) Mar 25: G2 (Moderate) Mar 26: 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 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.

04:11 UTC

Space Weather Message Code: WARK05
Serial Number: 1999
Issue Time: 2025 Mar 24 0411 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 24 0410 UTC
Valid To: 2025 Mar 24 1500 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.

02:35 UTC

Space Weather Message Code: ALTK04
Serial Number: 2538
Issue Time: 2025 Mar 24 0235 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 24 0233 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.

01:29 UTC

Space Weather Message Code: WARK04
Serial Number: 4886
Issue Time: 2025 Mar 24 0129 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 24 0129 UTC
Valid To: 2025 Mar 24 2359 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.

00:57 UTC

Space Weather Message Code: SUMSUD
Serial Number: 285
Issue Time: 2025 Mar 24 0057 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2025 Mar 24 0038 UTC
Deviation: 15 nT
Station: NGK

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

00:28 UTC

Space Weather Message Code: WARSUD
Serial Number: 241
Issue Time: 2025 Mar 24 0028 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2025 Mar 24 0030 UTC
Valid To: 2025 Mar 24 0130 UTC
IP Shock Passage Observed: 2025 Mar 24 0017 UTC

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Saturday, 22 March 2025

23:37 UTC

Space Weather Message Code: ALTK05
Serial Number: 1725
Issue Time: 2025 Mar 22 2337 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 22 2337 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.

23:05 UTC

Space Weather Message Code: WARK04
Serial Number: 4885
Issue Time: 2025 Mar 22 2305 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4884
Valid From: 2025 Mar 21 1715 UTC
Now Valid Until: 2025 Mar 23 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.

23:05 UTC

Space Weather Message Code: WARK05
Serial Number: 1998
Issue Time: 2025 Mar 22 2305 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1997
Valid From: 2025 Mar 22 1648 UTC
Now Valid Until: 2025 Mar 23 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.

16:49 UTC

Space Weather Message Code: WARK04
Serial Number: 4884
Issue Time: 2025 Mar 22 1649 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4883
Valid From: 2025 Mar 21 1715 UTC
Now Valid Until: 2025 Mar 22 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.

16:48 UTC

Space Weather Message Code: WARK05
Serial Number: 1997
Issue Time: 2025 Mar 22 1648 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 22 1648 UTC
Valid To: 2025 Mar 22 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.

11:21 UTC

Space Weather Message Code: WARK04
Serial Number: 4883
Issue Time: 2025 Mar 22 1121 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4882
Valid From: 2025 Mar 21 1715 UTC
Now Valid Until: 2025 Mar 22 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.

06:03 UTC

Space Weather Message Code: WARK04
Serial Number: 4882
Issue Time: 2025 Mar 22 0603 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4881
Valid From: 2025 Mar 21 1715 UTC
Now Valid Until: 2025 Mar 22 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.

03:37 UTC

Space Weather Message Code: ALTK05
Serial Number: 1724
Issue Time: 2025 Mar 22 0337 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 22 0335 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.

03:13 UTC

Space Weather Message Code: WATA50
Serial Number: 85
Issue Time: 2025 Mar 22 0313 UTC

WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Mar 23: G3 (Strong) Mar 24: G1 (Minor) Mar 25: 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 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.

03:02 UTC

Space Weather Message Code: ALTK06
Serial Number: 619
Issue Time: 2025 Mar 22 0302 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 22 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.

01:40 UTC

Space Weather Message Code: ALTK05
Serial Number: 1723
Issue Time: 2025 Mar 22 0139 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 22 0136 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.

Friday, 21 March 2025

23:35 UTC

Space Weather Message Code: ALTK05
Serial Number: 1722
Issue Time: 2025 Mar 21 2335 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 21 2330 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.

19:43 UTC

Space Weather Message Code: WARK06
Serial Number: 567
Issue Time: 2025 Mar 21 1943 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 21 1945 UTC
Valid To: 2025 Mar 22 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.

18:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1721
Issue Time: 2025 Mar 21 1855 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 21 1855 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.

17:33 UTC

Space Weather Message Code: WARK05
Serial Number: 1996
Issue Time: 2025 Mar 21 1733 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 21 1732 UTC
Valid To: 2025 Mar 22 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.

17:31 UTC

Space Weather Message Code: ALTK04
Serial Number: 2537
Issue Time: 2025 Mar 21 1731 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 21 1730 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.

17:12 UTC

Space Weather Message Code: WARK04
Serial Number: 4881
Issue Time: 2025 Mar 21 1712 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 21 1715 UTC
Valid To: 2025 Mar 22 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.

16:12 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1407
Issue Time: 2025 Mar 21 1612 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Mar 21 1557 UTC
Estimated Velocity: 242 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.

Wednesday, 19 March 2025

21:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1720
Issue Time: 2025 Mar 19 2103 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 19 2059 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.

20:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4880
Issue Time: 2025 Mar 19 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4879
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 20 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.

20:39 UTC

Space Weather Message Code: WARK05
Serial Number: 1995
Issue Time: 2025 Mar 19 2039 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 19 2039 UTC
Valid To: 2025 Mar 20 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.

07:50 UTC

Space Weather Message Code: WARK05
Serial Number: 1994
Issue Time: 2025 Mar 19 0750 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 19 0749 UTC
Valid To: 2025 Mar 19 1800 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.

05:15 UTC

Space Weather Message Code: WARK04
Serial Number: 4879
Issue Time: 2025 Mar 19 0515 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4878
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 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.

Tuesday, 18 March 2025

23:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4878
Issue Time: 2025 Mar 18 2352 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4877
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 19 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.

07:34 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3438
Issue Time: 2025 Mar 18 0734 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3437
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 6680 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

05:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4877
Issue Time: 2025 Mar 18 0556 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4876
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 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.

Monday, 17 March 2025

21:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2536
Issue Time: 2025 Mar 17 2102 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 17 2059 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.

20:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4876
Issue Time: 2025 Mar 17 2054 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4875
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 18 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.

14:48 UTC

Space Weather Message Code: WARK04
Serial Number: 4875
Issue Time: 2025 Mar 17 1448 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4874
Valid From: 2025 Mar 17 0345 UTC
Now Valid Until: 2025 Mar 17 2100 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.

05:21 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3437
Issue Time: 2025 Mar 17 0521 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3436
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 5055 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

03:48 UTC

Space Weather Message Code: WARK04
Serial Number: 4874
Issue Time: 2025 Mar 17 0348 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 17 0345 UTC
Valid To: 2025 Mar 17 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.

Sunday, 16 March 2025

14:48 UTC

Space Weather Message Code: WARK04
Serial Number: 4873
Issue Time: 2025 Mar 16 1448 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 16 1447 UTC
Valid To: 2025 Mar 17 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.

07:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3436
Issue Time: 2025 Mar 16 0737 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3435
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4951 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Saturday, 15 March 2025

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3435
Issue Time: 2025 Mar 15 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3434
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

01:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4872
Issue Time: 2025 Mar 15 0155 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4871
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 15 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.

01:42 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3434
Issue Time: 2025 Mar 15 0142 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3433
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 3982 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Friday, 14 March 2025

17:34 UTC

Space Weather Message Code: WARK04
Serial Number: 4871
Issue Time: 2025 Mar 14 1734 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4870
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 15 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.

10:45 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3433
Issue Time: 2025 Mar 14 1045 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3432
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

01:41 UTC

Space Weather Message Code: ALTK06
Serial Number: 618
Issue Time: 2025 Mar 14 0141 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 14 0142 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.

01:40 UTC

Space Weather Message Code: WARK06
Serial Number: 566
Issue Time: 2025 Mar 14 0140 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 14 0140 UTC
Valid To: 2025 Mar 14 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.

01:30 UTC

Space Weather Message Code: WARK05
Serial Number: 1993
Issue Time: 2025 Mar 14 0130 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1992
Valid From: 2025 Mar 13 1930 UTC
Now Valid Until: 2025 Mar 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 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.

01:29 UTC

Space Weather Message Code: WARK04
Serial Number: 4870
Issue Time: 2025 Mar 14 0129 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4869
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 14 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.

01:27 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3432
Issue Time: 2025 Mar 14 0127 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3431
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1561 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

01:25 UTC

Space Weather Message Code: ALTK05
Serial Number: 1719
Issue Time: 2025 Mar 14 0125 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 14 0120 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.

Thursday, 13 March 2025

19:50 UTC

Space Weather Message Code: ALTK05
Serial Number: 1718
Issue Time: 2025 Mar 13 1950 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 1944 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.

19:34 UTC

Space Weather Message Code: WARK05
Serial Number: 1992
Issue Time: 2025 Mar 13 1934 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 13 1930 UTC
Valid To: 2025 Mar 14 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.

19:00 UTC

Space Weather Message Code: WARK04
Serial Number: 4869
Issue Time: 2025 Mar 13 1900 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4868
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 14 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 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.

14:18 UTC

Space Weather Message Code: WARK04
Serial Number: 4868
Issue Time: 2025 Mar 13 1418 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4867
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 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.

14:18 UTC

Space Weather Message Code: WARK05
Serial Number: 1991
Issue Time: 2025 Mar 13 1418 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1990
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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.

13:24 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3431
Issue Time: 2025 Mar 13 1324 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3430
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 1994 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

12:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1717
Issue Time: 2025 Mar 13 1248 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 1248 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.

12:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1716
Issue Time: 2025 Mar 13 1201 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 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.

08:40 UTC

Space Weather Message Code: ALTK05
Serial Number: 1715
Issue Time: 2025 Mar 13 0840 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0839 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.

05:55 UTC

Space Weather Message Code: WARK05
Serial Number: 1990
Issue Time: 2025 Mar 13 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1989
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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.

05:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4867
Issue Time: 2025 Mar 13 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4866
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 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.

04:35 UTC

Space Weather Message Code: ALTK05
Serial Number: 1714
Issue Time: 2025 Mar 13 0435 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0435 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.

01:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1713
Issue Time: 2025 Mar 13 0132 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 13 0131 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.

Wednesday, 12 March 2025

23:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 1712
Issue Time: 2025 Mar 12 2353 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2353 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.

23:02 UTC

Space Weather Message Code: WARK05
Serial Number: 1989
Issue Time: 2025 Mar 12 2302 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1988
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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.

20:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 1711
Issue Time: 2025 Mar 12 2055 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 2051 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.

17:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4866
Issue Time: 2025 Mar 12 1752 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4865
Valid From: 2025 Mar 12 0735 UTC
Now Valid Until: 2025 Mar 13 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.

17:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1988
Issue Time: 2025 Mar 12 1751 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1987
Valid From: 2025 Mar 12 1050 UTC
Now Valid Until: 2025 Mar 13 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 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.

17:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 1710
Issue Time: 2025 Mar 12 1749 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 12 1742 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.

11:16 UTC

Space Weather Message Code: ALTK04
Serial Number: 2535
Issue Time: 2025 Mar 12 1116 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 1030 UTC
Synoptic Period: 0900-1200 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.

10:50 UTC

Space Weather Message Code: WARK05
Serial Number: 1987
Issue Time: 2025 Mar 12 1050 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 12 1050 UTC
Valid To: 2025 Mar 12 1800 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.

07:47 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1406
Issue Time: 2025 Mar 12 0747 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Mar 12 0503 UTC
Estimated Velocity: 403 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.

07:35 UTC

Space Weather Message Code: WARK04
Serial Number: 4865
Issue Time: 2025 Mar 12 0735 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0735 UTC
Valid To: 2025 Mar 12 2100 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.

07:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3430
Issue Time: 2025 Mar 12 0701 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3429
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 4110 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

02:37 UTC

Space Weather Message Code: ALTK04
Serial Number: 2534
Issue Time: 2025 Mar 12 0237 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 12 0236 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.

00:07 UTC

Space Weather Message Code: WARK04
Serial Number: 4864
Issue Time: 2025 Mar 12 0007 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 12 0006 UTC
Valid To: 2025 Mar 12 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.

Tuesday, 11 March 2025

09:22 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3429
Issue Time: 2025 Mar 11 0922 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3428
Begin Time: 2025 Mar 10 1150 UTC
Yesterday Maximum 2MeV Flux: 2397 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 10 March 2025

12:07 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3428
Issue Time: 2025 Mar 10 1207 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 10 1150 UTC
Station: GOES16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Sunday, 9 March 2025

23:20 UTC

Space Weather Message Code: WARK06
Serial Number: 565
Issue Time: 2025 Mar 09 2320 UTC

CANCEL WARNING: Geomagnetic K-Index of 6 expected
Cancel Serial Number: 564
Original Issue Time: 2025 Mar 09 0423 UTC

Comment: The previous extention was an error. The conditions for this level of geomagnetic activity no longer exist.

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.

23:19 UTC

Space Weather Message Code: WARK04
Serial Number: 4863
Issue Time: 2025 Mar 09 2319 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4862
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 10 0600 UTC
Warning Condition: Persisence

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.

23:18 UTC

Space Weather Message Code: WARK06
Serial Number: 564
Issue Time: 2025 Mar 09 2318 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 563
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 10 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.

10:40 UTC

Space Weather Message Code: WARK06
Serial Number: 563
Issue Time: 2025 Mar 09 1040 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 562
Valid From: 2025 Mar 09 0422 UTC
Now Valid Until: 2025 Mar 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 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.

10:40 UTC

Space Weather Message Code: ALTK06
Serial Number: 617
Issue Time: 2025 Mar 09 1040 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 1040 UTC
Synoptic Period: 0900-1200 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.

09:32 UTC

Space Weather Message Code: ALTK05
Serial Number: 1709
Issue Time: 2025 Mar 09 0932 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0931 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.

05:59 UTC

Space Weather Message Code: ALTK06
Serial Number: 616
Issue Time: 2025 Mar 09 0559 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Mar 09 0559 UTC
Synoptic Period: 0300-0600 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.

04:23 UTC

Space Weather Message Code: WARK06
Serial Number: 562
Issue Time: 2025 Mar 09 0423 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Mar 09 0422 UTC
Valid To: 2025 Mar 09 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.

04:23 UTC

Space Weather Message Code: WARK05
Serial Number: 1986
Issue Time: 2025 Mar 09 0423 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1985
Valid From: 2025 Mar 08 2019 UTC
Now Valid Until: 2025 Mar 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 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.

04:23 UTC

Space Weather Message Code: WARK04
Serial Number: 4862
Issue Time: 2025 Mar 09 0423 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4861
Valid From: 2025 Mar 08 1500 UTC
Now Valid Until: 2025 Mar 09 2359 UTC
Warning Condition: Persisence

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.

04:06 UTC

Space Weather Message Code: ALTK05
Serial Number: 1708
Issue Time: 2025 Mar 09 0406 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 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.

02:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1707
Issue Time: 2025 Mar 09 0257 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 09 0255 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.

Saturday, 8 March 2025

23:15 UTC

Space Weather Message Code: ALTK05
Serial Number: 1706
Issue Time: 2025 Mar 08 2315 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 2310 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.

21:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1705
Issue Time: 2025 Mar 08 2103 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Mar 08 2059 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.

20:20 UTC

Space Weather Message Code: WARK05
Serial Number: 1985
Issue Time: 2025 Mar 08 2020 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 08 2019 UTC
Valid To: 2025 Mar 09 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.

14:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4861
Issue Time: 2025 Mar 08 1456 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 1500 UTC
Valid To: 2025 Mar 09 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.

09:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2533
Issue Time: 2025 Mar 08 0901 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 08 0859 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.

06:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4860
Issue Time: 2025 Mar 08 0658 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 08 0700 UTC
Valid To: 2025 Mar 08 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.

Friday, 7 March 2025

19:12 UTC

Space Weather Message Code: WATA20
Serial Number: 1033
Issue Time: 2025 Mar 07 1912 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 08: None (Below G1) Mar 09: G1 (Minor) Mar 10: 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.

02:56 UTC

Space Weather Message Code: WATA20
Serial Number: 1032
Issue Time: 2025 Mar 07 0256 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 07: None (Below G1) Mar 08: None (Below G1) Mar 09: 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.

Wednesday, 5 March 2025

11:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4859
Issue Time: 2025 Mar 05 1154 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4858
Valid From: 2025 Mar 04 2132 UTC
Now Valid Until: 2025 Mar 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.

Tuesday, 4 March 2025

21:39 UTC

Space Weather Message Code: WARK05
Serial Number: 1984
Issue Time: 2025 Mar 04 2139 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Mar 04 2139 UTC
Valid To: 2025 Mar 05 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.

21:36 UTC

Space Weather Message Code: ALTK04
Serial Number: 2532
Issue Time: 2025 Mar 04 2136 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Mar 04 2127 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.

21:33 UTC

Space Weather Message Code: WARK04
Serial Number: 4858
Issue Time: 2025 Mar 04 2133 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Mar 04 2132 UTC
Valid To: 2025 Mar 05 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.

18:44 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3427
Issue Time: 2025 Mar 04 1844 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3426
Begin Time: 2025 Mar 02 1510 UTC
Yesterday Maximum 2MeV Flux: 1134 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Sunday, 2 March 2025

15:48 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3426
Issue Time: 2025 Mar 02 1548 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Mar 02 1510 UTC
Station: GOES-16




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

05:22 UTC

Space Weather Message Code: WATA20
Serial Number: 1031
Issue Time: 2025 Mar 02 0522 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 03: None (Below G1) Mar 04: G1 (Minor) Mar 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.

Saturday, 1 March 2025

21:11 UTC

Space Weather Message Code: WARK04
Serial Number: 4857
Issue Time: 2025 Mar 01 2111 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4856
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 02 1200 UTC
Warning Condition: Persistence

Comment: Correction for valid time date from 01 Mar to 02 Mar.

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.

20:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4856
Issue Time: 2025 Mar 01 2055 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4855
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 01 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.

Friday, 28 February 2025

17:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1704
Issue Time: 2025 Feb 28 1757 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 1757 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.

17:18 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1405
Issue Time: 2025 Feb 28 1718 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 28 1700 UTC
Estimated Velocity: 1151 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.

15:00 UTC

Space Weather Message Code: ALTK05
Serial Number: 1703
Issue Time: 2025 Feb 28 1500 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 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.

14:19 UTC

Space Weather Message Code: WARK05
Serial Number: 1983
Issue Time: 2025 Feb 28 1419 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1982
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Mar 01 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.

14:17 UTC

Space Weather Message Code: WARK04
Serial Number: 4855
Issue Time: 2025 Feb 28 1417 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4854
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Mar 01 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.

05:54 UTC

Space Weather Message Code: WARK05
Serial Number: 1982
Issue Time: 2025 Feb 28 0554 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1981
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 28 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.

02:17 UTC

Space Weather Message Code: ALTK05
Serial Number: 1702
Issue Time: 2025 Feb 28 0217 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 28 0215 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.

Thursday, 27 February 2025

23:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1981
Issue Time: 2025 Feb 27 2356 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1980
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 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.

18:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1701
Issue Time: 2025 Feb 27 1802 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 1759 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.

17:42 UTC

Space Weather Message Code: WARK04
Serial Number: 4854
Issue Time: 2025 Feb 27 1742 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4853
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 28 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.

17:38 UTC

Space Weather Message Code: WARK05
Serial Number: 1980
Issue Time: 2025 Feb 27 1738 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1979
Valid From: 2025 Feb 27 1052 UTC
Now Valid Until: 2025 Feb 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 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.

11:14 UTC

Space Weather Message Code: ALTK06
Serial Number: 615
Issue Time: 2025 Feb 27 1114 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025 Feb 27 1110 UTC
Synoptic Period: 0900-1200 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.

11:09 UTC

Space Weather Message Code: WARK06
Serial Number: 561
Issue Time: 2025 Feb 27 1109 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025 Feb 27 1108 UTC
Valid To: 2025 Feb 27 1500 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.

10:57 UTC

Space Weather Message Code: ALTK05
Serial Number: 1700
Issue Time: 2025 Feb 27 1057 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 Feb 27 1052 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.

10:53 UTC

Space Weather Message Code: WARK05
Serial Number: 1979
Issue Time: 2025 Feb 27 1053 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 27 1052 UTC
Valid To: 2025 Feb 27 1800 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.

10:47 UTC

Space Weather Message Code: WARK04
Serial Number: 4853
Issue Time: 2025 Feb 27 1047 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4852
Valid From: 2025 Feb 27 0101 UTC
Now Valid Until: 2025 Feb 27 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.

02:22 UTC

Space Weather Message Code: ALTK04
Serial Number: 2531
Issue Time: 2025 Feb 27 0222 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 27 0222 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.

01:01 UTC

Space Weather Message Code: WARK04
Serial Number: 4852
Issue Time: 2025 Feb 27 0101 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 27 0101 UTC
Valid To: 2025 Feb 27 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.

Wednesday, 26 February 2025

14:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4851
Issue Time: 2025 Feb 26 1454 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4850
Valid From: 2025 Feb 26 0431 UTC
Now Valid Until: 2025 Feb 26 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.

12:03 UTC

Space Weather Message Code: SUMPX1
Serial Number: 121
Issue Time: 2025 Feb 26 1203 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 UTC
Maximum Time: 2025 Feb 25 0240 UTC
End Time: 2025 Feb 25 1115 UTC
Maximum 10MeV Flux: 37 pfu
NOAA Scale: S1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

06:02 UTC

Space Weather Message Code: ALTK04
Serial Number: 2530
Issue Time: 2025 Feb 26 0602 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 26 0553 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.

04:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4850
Issue Time: 2025 Feb 26 0432 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 26 0431 UTC
Valid To: 2025 Feb 26 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.

Tuesday, 25 February 2025

23:43 UTC

Space Weather Message Code: WARPX1
Serial Number: 596
Issue Time: 2025 Feb 25 2343 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 595
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 26 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.

23:26 UTC

Space Weather Message Code: WARK04
Serial Number: 4849
Issue Time: 2025 Feb 25 2326 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 25 2325 UTC
Valid To: 2025 Feb 26 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.

14:47 UTC

Space Weather Message Code: WARPX1
Serial Number: 595
Issue Time: 2025 Feb 25 1447 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 594
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 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.

12:32 UTC

Space Weather Message Code: SUM10R
Serial Number: 861
Issue Time: 2025 Feb 25 1232 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2025 Feb 25 1136 UTC
Maximum Time: 2025 Feb 25 1137 UTC
End Time: 2025 Feb 25 1149 UTC
Duration: 13 minutes
Peak Flux: 230 sfu
Latest Penticton Noon Flux: 203 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.

12:31 UTC

Space Weather Message Code: ALTTP4
Serial Number: 678
Issue Time: 2025 Feb 25 1231 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Feb 25 1139 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.

12:31 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1404
Issue Time: 2025 Feb 25 1231 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 25 1145 UTC
Estimated Velocity: 630 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.

11:49 UTC

Space Weather Message Code: WARPX1
Serial Number: 594
Issue Time: 2025 Feb 25 1149 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 593
Valid From: 2025 Feb 24 2338 UTC
Now Valid Until: 2025 Feb 25 2100 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.

00:28 UTC

Space Weather Message Code: ALTPX1
Serial Number: 356
Issue Time: 2025 Feb 25 0028 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Feb 25 0020 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.

Monday, 24 February 2025

23:57 UTC

Space Weather Message Code: WARK04
Serial Number: 4848
Issue Time: 2025 Feb 24 2357 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4847
Valid From: 2025 Feb 24 1325 UTC
Now Valid Until: 2025 Feb 25 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.

23:38 UTC

Space Weather Message Code: WARPX1
Serial Number: 593
Issue Time: 2025 Feb 24 2338 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2025 Feb 24 2338 UTC
Valid To: 2025 Feb 25 1200 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.

22:42 UTC

Space Weather Message Code: ALTTP4
Serial Number: 677
Issue Time: 2025 Feb 24 2242 UTC

ALERT: Type IV Radio Emission
Begin Time: 2025 Feb 24 2220 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.

22:31 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1403
Issue Time: 2025 Feb 24 2231 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 24 2209 UTC
Estimated Velocity: 641 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.

20:10 UTC

Space Weather Message Code: WARK05
Serial Number: 1978
Issue Time: 2025 Feb 24 2010 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Feb 24 2010 UTC
Valid To: 2025 Feb 24 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.

20:04 UTC

Space Weather Message Code: ALTK04
Serial Number: 2529
Issue Time: 2025 Feb 24 2004 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025 Feb 24 1958 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.

13:25 UTC

Space Weather Message Code: WARK04
Serial Number: 4847
Issue Time: 2025 Feb 24 1325 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 1325 UTC
Valid To: 2025 Feb 24 2359 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.

07:22 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1402
Issue Time: 2025 Feb 24 0722 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Feb 24 0703 UTC
Estimated Velocity: 588 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.

02:22 UTC

Space Weather Message Code: WARK04
Serial Number: 4846
Issue Time: 2025 Feb 24 0222 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Feb 24 0222 UTC
Valid To: 2025 Feb 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.

Sunday, 23 February 2025

20:14 UTC

Space Weather Message Code: SUMX01
Serial Number: 189
Issue Time: 2025 Feb 23 2014 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2025 Feb 23 1922 UTC
Maximum Time: 2025 Feb 23 1927 UTC
End Time: 2025 Feb 23 1934 UTC
X-ray Class: X2.0
Location: N26W90
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.

19:31 UTC

Space Weather Message Code: ALTXMF
Serial Number: 476
Issue Time: 2025 Feb 23 1931 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Feb 23 1925 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.