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.

Monday, 18 March 2024

19:42 UTC

Space Weather Message Code: SUMXM5
Serial Number: 207
Issue Time: 2024 Mar 18 1942 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 18 1902 UTC
Maximum Time: 2024 Mar 18 1919 UTC
End Time: 2024 Mar 18 1928 UTC
X-ray Class: M6.7
Location: S12E62
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.

19:18 UTC

Space Weather Message Code: ALTXMF
Serial Number: 347
Issue Time: 2024 Mar 18 1918 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 18 1916 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.

10:11 UTC

Space Weather Message Code: WATA20
Serial Number: 991
Issue Time: 2024 Mar 18 1011 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 19: None (Below G1) Mar 20: G1 (Minor) Mar 21: 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, 16 March 2024

20:20 UTC

Space Weather Message Code: SUMPX1
Serial Number: 109
Issue Time: 2024 Mar 16 2020 UTC

SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 15 2050 UTC
Maximum Time: 2024 Mar 16 0635 UTC
End Time: 2024 Mar 16 1505 UTC
Maximum 10MeV Flux: 16 pfu
NOAA Scale: S1 - Minor

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

20:20 UTC

Space Weather Message Code: WARPX1
Serial Number: 550
Issue Time: 2024 Mar 16 2020 UTC

CANCEL WARNING: Proton 10MeV Integral Flux above 10pfu expected
Cancel Serial Number: 549
Original Issue Time: 2024 Mar 15 1544 UTC

Comment: The 10 MeV proton flux has decreased below event thresholds.

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.

05:55 UTC

Space Weather Message Code: WARPX1
Serial Number: 549
Issue Time: 2024 Mar 16 0555 UTC

EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 548
Valid From: 2024 Mar 15 1545 UTC
Now Valid Until: 2024 Mar 16 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.

Friday, 15 March 2024

21:06 UTC

Space Weather Message Code: ALTPX1
Serial Number: 344
Issue Time: 2024 Mar 15 2106 UTC

ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 15 2050 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.

15:44 UTC

Space Weather Message Code: WARPX1
Serial Number: 548
Issue Time: 2024 Mar 15 1544 UTC

WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Mar 15 1545 UTC
Valid To: 2024 Mar 16 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.

03:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2432
Issue Time: 2024 Mar 15 0301 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 15 0259 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.

00:55 UTC

Space Weather Message Code: WARK04
Serial Number: 4560
Issue Time: 2024 Mar 15 0055 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 15 0055 UTC
Valid To: 2024 Mar 15 1200 UTC
Warning Condition: Onset

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

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Wednesday, 13 March 2024

07:39 UTC

Space Weather Message Code: WARK04
Serial Number: 4559
Issue Time: 2024 Mar 13 0739 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 13 0738 UTC
Valid To: 2024 Mar 13 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.

Monday, 11 March 2024

14:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3394
Issue Time: 2024 Mar 11 1403 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2024 Mar 11 1345 UTC
Station: GOES16




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

09:17 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1282
Issue Time: 2024 Mar 11 0917 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Mar 11 0853 UTC
Estimated Velocity: 489 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, 10 March 2024

18:07 UTC

Space Weather Message Code: SUM10R
Serial Number: 786
Issue Time: 2024 Mar 10 1807 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 10 1530 UTC
Maximum Time: 2024 Mar 10 1532 UTC
End Time: 2024 Mar 10 1533 UTC
Duration: 3 minutes
Peak Flux: 150 sfu
Latest Penticton Noon Flux: 135 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.

12:38 UTC

Space Weather Message Code: SUMXM5
Serial Number: 206
Issue Time: 2024 Mar 10 1238 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 10 1200 UTC
Maximum Time: 2024 Mar 10 1213 UTC
End Time: 2024 Mar 10 1220 UTC
X-ray Class: M7.4
Location: S13W35
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.

12:33 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1281
Issue Time: 2024 Mar 10 1233 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Mar 10 1208 UTC
Estimated Velocity: 714 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.

12:32 UTC

Space Weather Message Code: SUM10R
Serial Number: 785
Issue Time: 2024 Mar 10 1232 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 10 1208 UTC
Maximum Time: 2024 Mar 10 1209 UTC
End Time: 2024 Mar 10 1212 UTC
Duration: 4 minutes
Peak Flux: 340 sfu
Latest Penticton Noon Flux: 135 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.

12:13 UTC

Space Weather Message Code: ALTXMF
Serial Number: 346
Issue Time: 2024 Mar 10 1213 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 10 1211 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.

Saturday, 9 March 2024

00:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2431
Issue Time: 2024 Mar 09 0001 UTC

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

Friday, 8 March 2024

22:32 UTC

Space Weather Message Code: WARK04
Serial Number: 4558
Issue Time: 2024 Mar 08 2232 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 08 2231 UTC
Valid To: 2024 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.

05:52 UTC

Space Weather Message Code: WARK04
Serial Number: 4557
Issue Time: 2024 Mar 08 0552 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4556
Valid From: 2024 Mar 07 1800 UTC
Now Valid Until: 2024 Mar 08 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.

04:05 UTC

Space Weather Message Code: ALTTP4
Serial Number: 628
Issue Time: 2024 Mar 08 0405 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Mar 08 0347 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.

03:57 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1280
Issue Time: 2024 Mar 08 0357 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Mar 08 0340 UTC
Estimated Velocity: 1242 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.

Thursday, 7 March 2024

23:52 UTC

Space Weather Message Code: ALTK04
Serial Number: 2430
Issue Time: 2024 Mar 07 2352 UTC

CANCEL ALERT: Geomagnetic K-index of 4
Cancel Serial Number: 2429
Original Issue Time: 2024 Mar 07 2344 UTC

Comment: Bad magnetometer data at the Ottawa site caused a false Kp=4 (Active) event. Disregard previous K-index of 4 alert. Kp=4 warning still valid until 08 Mar at 0600 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.

23:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4556
Issue Time: 2024 Mar 07 2345 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4555
Valid From: 2024 Mar 07 1800 UTC
Now Valid Until: 2024 Mar 08 0600 UTC
Warning Condition: Onset

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

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

23:44 UTC

Space Weather Message Code: ALTK04
Serial Number: 2429
Issue Time: 2024 Mar 07 2344 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 07 2343 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

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

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

23:21 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1279
Issue Time: 2024 Mar 07 2321 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Mar 07 2225 UTC
Estimated Velocity: 904 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.

17:56 UTC

Space Weather Message Code: WARK04
Serial Number: 4555
Issue Time: 2024 Mar 07 1756 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 07 1800 UTC
Valid To: 2024 Mar 07 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.

Wednesday, 6 March 2024

18:30 UTC

Space Weather Message Code: WATA20
Serial Number: 990
Issue Time: 2024 Mar 06 1830 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.

04:04 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1278
Issue Time: 2024 Mar 06 0404 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Mar 06 0333 UTC
Estimated Velocity: 1516 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 March 2024

23:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4554
Issue Time: 2024 Mar 03 2345 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4553
Valid From: 2024 Mar 03 1010 UTC
Now Valid Until: 2024 Mar 04 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.

21:24 UTC

Space Weather Message Code: ALTK06
Serial Number: 548
Issue Time: 2024 Mar 03 2124 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Mar 03 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

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

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

19:55 UTC

Space Weather Message Code: WARK06
Serial Number: 510
Issue Time: 2024 Mar 03 1955 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Mar 03 1954 UTC
Valid To: 2024 Mar 03 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.

18:48 UTC

Space Weather Message Code: ALTK05
Serial Number: 1553
Issue Time: 2024 Mar 03 1848 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1844 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.

17:31 UTC

Space Weather Message Code: ALTK05
Serial Number: 1552
Issue Time: 2024 Mar 03 1731 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1725 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

14:28 UTC

Space Weather Message Code: ALTK05
Serial Number: 1551
Issue Time: 2024 Mar 03 1428 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 03 1424 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

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

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

13:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4553
Issue Time: 2024 Mar 03 1354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4552
Valid From: 2024 Mar 03 1010 UTC
Now Valid Until: 2024 Mar 03 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.

13:53 UTC

Space Weather Message Code: WARK05
Serial Number: 1854
Issue Time: 2024 Mar 03 1353 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Mar 03 1352 UTC
Valid To: 2024 Mar 03 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.

13:34 UTC

Space Weather Message Code: ALTK04
Serial Number: 2428
Issue Time: 2024 Mar 03 1334 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 03 1330 UTC
Synoptic Period: 1200-1500 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.

10:09 UTC

Space Weather Message Code: WARK04
Serial Number: 4552
Issue Time: 2024 Mar 03 1009 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 03 1010 UTC
Valid To: 2024 Mar 03 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.

Wednesday, 28 February 2024

09:36 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1277
Issue Time: 2024 Feb 28 0936 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Feb 28 0907 UTC
Estimated Velocity: 432 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.

Tuesday, 27 February 2024

06:01 UTC

Space Weather Message Code: ALTK05
Serial Number: 1550
Issue Time: 2024 Feb 27 0601 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Feb 27 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.

03:51 UTC

Space Weather Message Code: WARK04
Serial Number: 4551
Issue Time: 2024 Feb 27 0351 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4550
Valid From: 2024 Feb 27 0113 UTC
Now Valid Until: 2024 Feb 27 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.

03:51 UTC

Space Weather Message Code: WARK05
Serial Number: 1853
Issue Time: 2024 Feb 27 0351 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Feb 27 0350 UTC
Valid To: 2024 Feb 27 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.

03:05 UTC

Space Weather Message Code: ALTK04
Serial Number: 2427
Issue Time: 2024 Feb 27 0305 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Feb 27 0259 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.

01:13 UTC

Space Weather Message Code: WARK04
Serial Number: 4550
Issue Time: 2024 Feb 27 0113 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Feb 27 0113 UTC
Valid To: 2024 Feb 27 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.

Sunday, 25 February 2024

14:54 UTC

Space Weather Message Code: WARK04
Serial Number: 4549
Issue Time: 2024 Feb 25 1454 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4548
Valid From: 2024 Feb 25 0545 UTC
Now Valid Until: 2024 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.

05:45 UTC

Space Weather Message Code: WARK04
Serial Number: 4548
Issue Time: 2024 Feb 25 0545 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Feb 25 0545 UTC
Valid To: 2024 Feb 25 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.

Thursday, 22 February 2024

23:41 UTC

Space Weather Message Code: SUM10R
Serial Number: 784
Issue Time: 2024 Feb 22 2341 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2024 Feb 22 2224 UTC
Maximum Time: 2024 Feb 22 2225 UTC
End Time: 2024 Feb 22 2235 UTC
Duration: 11 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 173 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.

22:53 UTC

Space Weather Message Code: SUMX01
Serial Number: 139
Issue Time: 2024 Feb 22 2253 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 22 2208 UTC
Maximum Time: 2024 Feb 22 2234 UTC
End Time: 2024 Feb 22 2243 UTC
X-ray Class: X6.3
Optical Class: 3b
Location: N22E24
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.

22:30 UTC

Space Weather Message Code: ALTXMF
Serial Number: 345
Issue Time: 2024 Feb 22 2230 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 22 2225 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.

19:17 UTC

Space Weather Message Code: WATA20
Serial Number: 989
Issue Time: 2024 Feb 22 1917 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 23: None (Below G1) Feb 24: None (Below G1) Feb 25: 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.

12:26 UTC

Space Weather Message Code: ALTTP4
Serial Number: 627
Issue Time: 2024 Feb 22 1226 UTC

ALERT: Type IV Radio Emission
Begin Time: 2024 Feb 22 1158 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.

10:08 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1276
Issue Time: 2024 Feb 22 1008 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Feb 22 0944 UTC
Estimated Velocity: 154 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.

06:47 UTC

Space Weather Message Code: SUMX01
Serial Number: 138
Issue Time: 2024 Feb 22 0647 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 22 0617 UTC
Maximum Time: 2024 Feb 22 0632 UTC
End Time: 2024 Feb 22 0640 UTC
X-ray Class: X1.7
Optical Class: 2b
Location: N14E35
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.

06:31 UTC

Space Weather Message Code: ALTXMF
Serial Number: 344
Issue Time: 2024 Feb 22 0631 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 22 0629 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.

Wednesday, 21 February 2024

23:21 UTC

Space Weather Message Code: SUMX01
Serial Number: 137
Issue Time: 2024 Feb 21 2321 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Feb 21 2252 UTC
Maximum Time: 2024 Feb 21 2307 UTC
End Time: 2024 Feb 21 2314 UTC
X-ray Class: X1.8
Location: N14E39
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.

23:06 UTC

Space Weather Message Code: ALTXMF
Serial Number: 343
Issue Time: 2024 Feb 21 2306 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Feb 21 2304 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.

04:13 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1275
Issue Time: 2024 Feb 21 0413 UTC

ALERT: Type II Radio Emission
Begin Time: 2024 Feb 21 0201 UTC
Estimated Velocity: 627 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.

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