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.

Wednesday, 20 November 2024

04:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4760
Issue Time: 2024 Nov 20 0452 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 20 0452 UTC
Valid To: 2024 Nov 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.

Tuesday, 19 November 2024

11:58 UTC

Space Weather Message Code: WARK04
Serial Number: 4759
Issue Time: 2024 Nov 19 1157 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 19 1157 UTC
Valid To: 2024 Nov 19 1800 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.

Saturday, 16 November 2024

12:04 UTC

Space Weather Message Code: WARK04
Serial Number: 4758
Issue Time: 2024 Nov 16 1204 UTC

CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 4757
Original Issue Time: 2024 Nov 16 0245 UTC

Comment: Incorrect date. This warning is canceled as of 16/1200 UTC.

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.

02:59 UTC

Space Weather Message Code: ALTK04
Serial Number: 2500
Issue Time: 2024 Nov 16 0259 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 16 0258 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.

02:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4757
Issue Time: 2024 Nov 16 0245 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 16 0245 UTC
Valid To: 2024 Nov 17 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.

Thursday, 14 November 2024

17:38 UTC

Space Weather Message Code: WARK04
Serial Number: 4756
Issue Time: 2024 Nov 14 1738 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4755
Valid From: 2024 Nov 14 0540 UTC
Now Valid Until: 2024 Nov 15 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.

05:42 UTC

Space Weather Message Code: WARK04
Serial Number: 4755
Issue Time: 2024 Nov 14 0542 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 14 0540 UTC
Valid To: 2024 Nov 14 1800 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, 10 November 2024

23:07 UTC

Space Weather Message Code: WARK04
Serial Number: 4754
Issue Time: 2024 Nov 10 2307 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4753
Valid From: 2024 Nov 08 1940 UTC
Now Valid Until: 2024 Nov 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.

20:34 UTC

Space Weather Message Code: SUM10R
Serial Number: 848
Issue Time: 2024 Nov 10 2034 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Nov 10 2015 UTC
Maximum Time: 2024 Nov 10 2018 UTC
End Time: 2024 Nov 10 2019 UTC
Duration: 4 minutes
Peak Flux: 370 sfu
Latest Penticton Noon Flux: 221 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.

19:40 UTC

Space Weather Message Code: WARK06
Serial Number: 554
Issue Time: 2024 Nov 10 1940 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Nov 10 1935 UTC
Valid To: 2024 Nov 10 2359 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.

19:10 UTC

Space Weather Message Code: ALTK05
Serial Number: 1678
Issue Time: 2024 Nov 10 1910 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Nov 10 1908 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.

14:46 UTC

Space Weather Message Code: WARK05
Serial Number: 1953
Issue Time: 2024 Nov 10 1446 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Nov 10 1445 UTC
Valid To: 2024 Nov 10 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.

12:28 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1375
Issue Time: 2024 Nov 10 1228 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 10 1207 UTC
Estimated Velocity: 928 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.

12:27 UTC

Space Weather Message Code: SUMXM5
Serial Number: 270
Issue Time: 2024 Nov 10 1227 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Nov 10 1151 UTC
Maximum Time: 2024 Nov 10 1206 UTC
End Time: 2024 Nov 10 1214 UTC
X-ray Class: M9.4
Optical Class: 2b
Location: S09E24
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.

12:25 UTC

Space Weather Message Code: SUM10R
Serial Number: 847
Issue Time: 2024 Nov 10 1225 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Nov 10 1203 UTC
Maximum Time: 2024 Nov 10 1204 UTC
End Time: 2024 Nov 10 1205 UTC
Duration: 2 minutes
Peak Flux: 400 sfu
Latest Penticton Noon Flux: 221 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.

12:07 UTC

Space Weather Message Code: ALTXMF
Serial Number: 452
Issue Time: 2024 Nov 10 1207 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 10 1203 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.

11:46 UTC

Space Weather Message Code: WARK04
Serial Number: 4753
Issue Time: 2024 Nov 10 1146 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4752
Valid From: 2024 Nov 08 1940 UTC
Now Valid Until: 2024 Nov 10 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.

Saturday, 9 November 2024

23:20 UTC

Space Weather Message Code: WARK04
Serial Number: 4752
Issue Time: 2024 Nov 09 2320 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4751
Valid From: 2024 Nov 08 1940 UTC
Now Valid Until: 2024 Nov 10 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.

13:38 UTC

Space Weather Message Code: ALTK05
Serial Number: 1677
Issue Time: 2024 Nov 09 1338 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Nov 09 1334 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: WARK05
Serial Number: 1952
Issue Time: 2024 Nov 09 1146 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1951
Valid From: 2024 Nov 09 0156 UTC
Now Valid Until: 2024 Nov 09 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.

11:46 UTC

Space Weather Message Code: ALTK05
Serial Number: 1676
Issue Time: 2024 Nov 09 1146 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Nov 09 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.

11:07 UTC

Space Weather Message Code: WARK04
Serial Number: 4751
Issue Time: 2024 Nov 09 1107 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4750
Valid From: 2024 Nov 08 1940 UTC
Now Valid Until: 2024 Nov 09 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.

01:56 UTC

Space Weather Message Code: WARK05
Serial Number: 1951
Issue Time: 2024 Nov 09 0156 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Nov 09 0156 UTC
Valid To: 2024 Nov 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.

Friday, 8 November 2024

20:12 UTC

Space Weather Message Code: ALTK04
Serial Number: 2499
Issue Time: 2024 Nov 08 2012 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 08 2010 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.

19:40 UTC

Space Weather Message Code: WARK04
Serial Number: 4750
Issue Time: 2024 Nov 08 1940 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 08 1940 UTC
Valid To: 2024 Nov 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.

Thursday, 7 November 2024

16:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3407
Issue Time: 2024 Nov 07 1603 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Nov 07 1535 UTC
Station: 16




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

08:14 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1374
Issue Time: 2024 Nov 07 0814 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 07 0535 UTC
Estimated Velocity: 281 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, 6 November 2024

14:50 UTC

Space Weather Message Code: SUMXM5
Serial Number: 269
Issue Time: 2024 Nov 06 1450 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Nov 06 1427 UTC
Maximum Time: 2024 Nov 06 1438 UTC
End Time: 2024 Nov 06 1445 UTC
X-ray Class: M5.3
Location: S07E68
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.

14:35 UTC

Space Weather Message Code: ALTXMF
Serial Number: 451
Issue Time: 2024 Nov 06 1435 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 06 1433 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.

14:04 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1373
Issue Time: 2024 Nov 06 1404 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 06 1350 UTC
Estimated Velocity: 256 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.

13:53 UTC

Space Weather Message Code: SUMX01
Serial Number: 181
Issue Time: 2024 Nov 06 1353 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Nov 06 1324 UTC
Maximum Time: 2024 Nov 06 1340 UTC
End Time: 2024 Nov 06 1346 UTC
X-ray Class: X2.3
Optical Class: 2b
Location: S09E17
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.

13:41 UTC

Space Weather Message Code: ALTXMF
Serial Number: 450
Issue Time: 2024 Nov 06 1341 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 06 1339 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.

09:09 UTC

Space Weather Message Code: SUMXM5
Serial Number: 268
Issue Time: 2024 Nov 06 0909 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Nov 06 0848 UTC
Maximum Time: 2024 Nov 06 0850 UTC
End Time: 2024 Nov 06 0854 UTC
X-ray Class: M5.8
Location: N15W57
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.

08:51 UTC

Space Weather Message Code: ALTXMF
Serial Number: 449
Issue Time: 2024 Nov 06 0851 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 06 0849 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.

02:42 UTC

Space Weather Message Code: WARK04
Serial Number: 4749
Issue Time: 2024 Nov 06 0242 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 06 0241 UTC
Valid To: 2024 Nov 06 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.

02:41 UTC

Space Weather Message Code: WARK04
Serial Number: 4748
Issue Time: 2024 Nov 06 0241 UTC

CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 4747
Original Issue Time: 2024 Nov 06 0238 UTC

Comment: Issued in error for valid to date

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.

02:38 UTC

Space Weather Message Code: WARK04
Serial Number: 4747
Issue Time: 2024 Nov 06 0238 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 06 0238 UTC
Valid To: 2024 Nov 07 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.

Tuesday, 5 November 2024

16:01 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1372
Issue Time: 2024 Nov 05 1601 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 05 1528 UTC
Estimated Velocity: 167 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.

Monday, 4 November 2024

19:27 UTC

Space Weather Message Code: WATA20
Serial Number: 1019
Issue Time: 2024 Nov 04 1927 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 05: None (Below G1) Nov 06: None (Below G1) Nov 07: 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.

16:00 UTC

Space Weather Message Code: SUMXM5
Serial Number: 267
Issue Time: 2024 Nov 04 1600 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Nov 04 1526 UTC
Maximum Time: 2024 Nov 04 1538 UTC
End Time: 2024 Nov 04 1541 UTC
X-ray Class: M5.5
Location: S10E40
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.

15:41 UTC

Space Weather Message Code: ALTXMF
Serial Number: 448
Issue Time: 2024 Nov 04 1541 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Nov 04 1537 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.

02:24 UTC

Space Weather Message Code: ALTTP4
Serial Number: 672
Issue Time: 2024 Nov 04 0224 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Nov 04 0134 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.

02:22 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1371
Issue Time: 2024 Nov 04 0222 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Nov 04 0128 UTC
Estimated Velocity: 307 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.

Sunday, 3 November 2024

21:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2498
Issue Time: 2024 Nov 03 2152 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 03 2152 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.

21:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4746
Issue Time: 2024 Nov 03 2132 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 03 2130 UTC
Valid To: 2024 Nov 04 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.

Saturday, 2 November 2024

23:06 UTC

Space Weather Message Code: WARK04
Serial Number: 4745
Issue Time: 2024 Nov 02 2306 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4744
Valid From: 2024 Nov 02 1138 UTC
Now Valid Until: 2024 Nov 03 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.

11:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2497
Issue Time: 2024 Nov 02 1152 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Nov 02 1150 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.

11:40 UTC

Space Weather Message Code: WARK04
Serial Number: 4744
Issue Time: 2024 Nov 02 1140 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Nov 02 1138 UTC
Valid To: 2024 Nov 02 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.

Friday, 1 November 2024

17:27 UTC

Space Weather Message Code: SUMPX1
Serial Number: 118
Issue Time: 2024 Nov 01 1727 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Oct 26 1910 UTC
Maximum Time: 2024 Oct 28 1350 UTC
End Time: 2024 Nov 01 0735 UTC
Maximum 10MeV Flux: 364 pfu
NOAA Scale: S2 - Moderate

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

17:27 UTC

Space Weather Message Code: WARPX1
Serial Number: 588
Issue Time: 2024 Nov 01 1727 UTC

CANCEL WARNING: Proton 10MeV Integral Flux above 10pfu expected
Cancel Serial Number: 587
Original Issue Time: 2024 Oct 31 0008 UTC

Comment: The greater than 10 MeV proton flux has decreased below 10 pfu and is no longer expected to reach event levels.

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.

11:24 UTC

Space Weather Message Code: ALTTP4
Serial Number: 671
Issue Time: 2024 Nov 01 1124 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Nov 01 1034 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.

00:06 UTC

Space Weather Message Code: ALTK04
Serial Number: 2496
Issue Time: 2024 Nov 01 0006 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Oct 31 2359 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.

Thursday, 31 October 2024

23:54 UTC

Space Weather Message Code: WARPX1
Serial Number: 587
Issue Time: 2024 Oct 31 2354 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 586
Valid From: 2024 Oct 31 0000 UTC
Now Valid Until: 2024 Nov 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.

22:12 UTC

Space Weather Message Code: SUM10R
Serial Number: 846
Issue Time: 2024 Oct 31 2212 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Oct 31 2110 UTC
Maximum Time: 2024 Oct 31 2111 UTC
End Time: 2024 Oct 31 2124 UTC
Duration: 14 minutes
Peak Flux: 910 sfu
Latest Penticton Noon Flux: 270 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.

22:01 UTC

Space Weather Message Code: WARK04
Serial Number: 4743
Issue Time: 2024 Oct 31 2201 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Oct 31 2200 UTC
Valid To: 2024 Nov 01 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.

21:38 UTC

Space Weather Message Code: SUMX01
Serial Number: 180
Issue Time: 2024 Oct 31 2138 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Oct 31 2112 UTC
Maximum Time: 2024 Oct 31 2120 UTC
End Time: 2024 Oct 31 2127 UTC
X-ray Class: X2.0
Optical Class: 3b
Location: N15E28
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.

21:16 UTC

Space Weather Message Code: ALTXMF
Serial Number: 447
Issue Time: 2024 Oct 31 2116 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Oct 31 2115 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.

00:08 UTC

Space Weather Message Code: WARPX1
Serial Number: 586
Issue Time: 2024 Oct 31 0008 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Oct 31 0000 UTC
Valid To: 2024 Oct 31 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.

Wednesday, 30 October 2024

21:18 UTC

Space Weather Message Code: SUMXM5
Serial Number: 266
Issue Time: 2024 Oct 30 2118 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Oct 30 2029 UTC
Maximum Time: 2024 Oct 30 2053 UTC
End Time: 2024 Oct 30 2114 UTC
X-ray Class: M7.2
Location: N16E42
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.

20:48 UTC

Space Weather Message Code: ALTXMF
Serial Number: 446
Issue Time: 2024 Oct 30 2048 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Oct 30 2047 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.

11:39 UTC

Space Weather Message Code: WARK04
Serial Number: 4742
Issue Time: 2024 Oct 30 1139 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4741
Valid From: 2024 Oct 29 2018 UTC
Now Valid Until: 2024 Oct 30 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.

02:38 UTC

Space Weather Message Code: WARK04
Serial Number: 4741
Issue Time: 2024 Oct 30 0238 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4740
Valid From: 2024 Oct 29 2018 UTC
Now Valid Until: 2024 Oct 30 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.

Tuesday, 29 October 2024

21:42 UTC

Space Weather Message Code: SUMPX2
Serial Number: 54
Issue Time: 2024 Oct 29 2142 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2024 Oct 27 0835 UTC
Maximum Time: 2024 Oct 28 1350 UTC
End Time: 2024 Oct 29 1510 UTC
Maximum 10MeV Flux: 364 pfu
NOAA Scale: S2 - Moderate

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

21:42 UTC

Space Weather Message Code: WARPX1
Serial Number: 585
Issue Time: 2024 Oct 29 2142 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 584
Valid From: 2024 Oct 26 1638 UTC
Now Valid Until: 2024 Oct 30 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.

20:46 UTC

Space Weather Message Code: ALTK04
Serial Number: 2495
Issue Time: 2024 Oct 29 2046 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Oct 29 2034 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.

20:18 UTC

Space Weather Message Code: WARK04
Serial Number: 4740
Issue Time: 2024 Oct 29 2018 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Oct 29 2018 UTC
Valid To: 2024 Oct 30 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.

Monday, 28 October 2024

22:30 UTC

Space Weather Message Code: WARPX1
Serial Number: 584
Issue Time: 2024 Oct 28 2230 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 583
Valid From: 2024 Oct 26 1638 UTC
Now Valid Until: 2024 Oct 29 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate

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.

05:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 1675
Issue Time: 2024 Oct 28 0559 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Oct 28 0559 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.

05:01 UTC

Space Weather Message Code: SUMSUD
Serial Number: 281
Issue Time: 2024 Oct 28 0501 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Oct 28 0446 UTC
Deviation: 48 nT
Station: CNB

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

04:41 UTC

Space Weather Message Code: WARK06
Serial Number: 553
Issue Time: 2024 Oct 28 0441 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Oct 28 0440 UTC
Valid To: 2024 Oct 28 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.

04:28 UTC

Space Weather Message Code: WARK04
Serial Number: 4739
Issue Time: 2024 Oct 28 0428 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4738
Valid From: 2024 Oct 26 1538 UTC
Now Valid Until: 2024 Oct 28 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.

04:28 UTC

Space Weather Message Code: WARK05
Serial Number: 1950
Issue Time: 2024 Oct 28 0428 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Oct 28 0430 UTC
Valid To: 2024 Oct 28 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.

04:24 UTC

Space Weather Message Code: WARSUD
Serial Number: 237
Issue Time: 2024 Oct 28 0424 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Oct 28 0440 UTC
Valid To: 2024 Oct 28 0540 UTC
IP Shock Passage Observed: 2024 Oct 28 0415 UTC

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

Sunday, 27 October 2024

23:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 583
Issue Time: 2024 Oct 27 2355 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 582
Valid From: 2024 Oct 26 1638 UTC
Now Valid Until: 2024 Oct 28 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate

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.

14:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4738
Issue Time: 2024 Oct 27 1455 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4737
Valid From: 2024 Oct 26 1538 UTC
Now Valid Until: 2024 Oct 28 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.

12:20 UTC

Space Weather Message Code: WATA30
Serial Number: 244
Issue Time: 2024 Oct 27 1220 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Oct 27: None (Below G1) Oct 28: G2 (Moderate) Oct 29: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Upgraded 28 Oct to G2 and added G1 for 29 Oct.

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.

09:02 UTC

Space Weather Message Code: ALTPX2
Serial Number: 75
Issue Time: 2024 Oct 27 0902 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2024 Oct 27 0835 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.

05:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 582
Issue Time: 2024 Oct 27 0555 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 581
Valid From: 2024 Oct 26 1638 UTC
Now Valid Until: 2024 Oct 27 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.

02:04 UTC

Space Weather Message Code: WARK04
Serial Number: 4737
Issue Time: 2024 Oct 27 0204 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4736
Valid From: 2024 Oct 26 1538 UTC
Now Valid Until: 2024 Oct 27 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.

Saturday, 26 October 2024

20:39 UTC

Space Weather Message Code: ALTK04
Serial Number: 2494
Issue Time: 2024 Oct 26 2039 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Oct 26 2035 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.

19:29 UTC

Space Weather Message Code: ALTPX1
Serial Number: 353
Issue Time: 2024 Oct 26 1929 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Oct 26 1910 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.

19:03 UTC

Space Weather Message Code: WATA20
Serial Number: 1018
Issue Time: 2024 Oct 26 1903 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 27: None (Below G1) Oct 28: G1 (Minor) Oct 29: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Potential glancing blow from the 26 Apr X-class event.

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.

16:38 UTC

Space Weather Message Code: WARPX1
Serial Number: 581
Issue Time: 2024 Oct 26 1638 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Oct 26 1638 UTC
Valid To: 2024 Oct 27 0600 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.

15:39 UTC

Space Weather Message Code: WARK04
Serial Number: 4736
Issue Time: 2024 Oct 26 1539 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Oct 26 1538 UTC
Valid To: 2024 Oct 27 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.

08:11 UTC

Space Weather Message Code: SUMX01
Serial Number: 179
Issue Time: 2024 Oct 26 0811 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Oct 26 0557 UTC
Maximum Time: 2024 Oct 26 0719 UTC
End Time: 2024 Oct 26 0756 UTC
X-ray Class: X1.8
Optical Class: 2n
Location: S16E55
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.

07:25 UTC

Space Weather Message Code: ALTTP4
Serial Number: 670
Issue Time: 2024 Oct 26 0725 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Oct 26 0629 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.

07:23 UTC

Space Weather Message Code: SUM10R
Serial Number: 845
Issue Time: 2024 Oct 26 0723 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Oct 26 0618 UTC
Maximum Time: 2024 Oct 26 0619 UTC
End Time: 2024 Oct 26 0623 UTC
Duration: 4 minutes
Peak Flux: 270 sfu
Latest Penticton Noon Flux: 209 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.

07:17 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1370
Issue Time: 2024 Oct 26 0717 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Oct 26 0629 UTC
Estimated Velocity: 486 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.

06:17 UTC

Space Weather Message Code: ALTXMF
Serial Number: 445
Issue Time: 2024 Oct 26 0617 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Oct 26 0613 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.

Thursday, 24 October 2024

17:02 UTC

Space Weather Message Code: WATA20
Serial Number: 1017
Issue Time: 2024 Oct 24 1702 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Oct 25: None (Below G1) Oct 26: G1 (Minor) Oct 27: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Comment: Possible glancing blow from the X3.3 flare/CME early on 24 Oct.

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.

06:54 UTC

Space Weather Message Code: SUM10R
Serial Number: 844
Issue Time: 2024 Oct 24 0654 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Oct 24 0338 UTC
Maximum Time: 2024 Oct 24 0344 UTC
End Time: 2024 Oct 24 0350 UTC
Duration: 12 minutes
Peak Flux: 5900 sfu
Latest Penticton Noon Flux: 185 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.

05:53 UTC

Space Weather Message Code: WARK05
Serial Number: 1949
Issue Time: 2024 Oct 24 0553 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Oct 24 0553 UTC
Valid To: 2024 Oct 24 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.

05:29 UTC

Space Weather Message Code: ALTK04
Serial Number: 2493
Issue Time: 2024 Oct 24 0529 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Oct 24 0525 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.

05:12 UTC

Space Weather Message Code: WARK04
Serial Number: 4735
Issue Time: 2024 Oct 24 0512 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Oct 24 0512 UTC
Valid To: 2024 Oct 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.

04:33 UTC

Space Weather Message Code: SUMX01
Serial Number: 178
Issue Time: 2024 Oct 24 0433 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Oct 24 0330 UTC
Maximum Time: 2024 Oct 24 0357 UTC
End Time: 2024 Oct 24 0428 UTC
X-ray Class: X3.3
Optical Class: sf
Location: S17E68
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.

04:07 UTC

Space Weather Message Code: ALTTP4
Serial Number: 669
Issue Time: 2024 Oct 24 0407 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Oct 24 0346 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.

04:06 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1369
Issue Time: 2024 Oct 24 0406 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Oct 24 0346 UTC
Estimated Velocity: 610 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.

03:44 UTC

Space Weather Message Code: ALTXMF
Serial Number: 444
Issue Time: 2024 Oct 24 0344 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Oct 24 0341 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.