Space Weather Alerts, Watches and Warnings
Issue Time: 2024 Apr 11 1727 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Apr 11 1652 UTC
Maximum Time: 2024 Apr 11 1706 UTC
End Time: 2024 Apr 11 1711 UTC
X-ray Class: M5.4
Location: S15E90
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Apr 11 1714 UTC
ALERT: Type IV Radio Emission
Begin Time: 2024 Apr 11 1659 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.

Issue Time: 2024 Apr 11 1707 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Apr 11 1705 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Apr 09 0534 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 09 0533 UTC
Valid To: 2024 Apr 09 1200 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 08 0521 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 08 0520 UTC
Valid To: 2024 Apr 08 1500 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 06 0203 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 06 0205 UTC
Valid To: 2024 Apr 06 1200 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 05 1806 UTC
CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 994
Original Issue Time: 2024 Apr 02 1926 UTC
Comment: Conditions no longer meet watch criteria.
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.

Issue Time: 2024 Apr 05 0555 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4580
Valid From: 2024 Apr 04 1138 UTC
Now Valid Until: 2024 Apr 05 2359 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Apr 05 0002 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Apr 04 2359 UTC
Synoptic Period: 2100-0000 UTC

Active Warning: Yes
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.

Issue Time: 2024 Apr 04 2256 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4579
Valid From: 2024 Apr 04 1138 UTC
Now Valid Until: 2024 Apr 05 0600 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 04 1139 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 04 1138 UTC
Valid To: 2024 Apr 04 2359 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 03 0210 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 03 0210 UTC
Valid To: 2024 Apr 03 0600 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 02 1926 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 03: None (Below G1) Apr 04: G1 (Minor) Apr 05: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2024 Apr 02 1103 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 02 1102 UTC
Valid To: 2024 Apr 02 1800 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Apr 01 1808 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 02: None (Below G1) Apr 03: None (Below G1) Apr 04: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2024 Apr 01 0803 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Apr 01 0803 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
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.

Issue Time: 2024 Apr 01 0739 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Apr 01 0740 UTC
Valid To: 2024 Apr 01 1500 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Mar 31 0200 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 31 0158 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
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.

Issue Time: 2024 Mar 31 0148 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 31 0147 UTC
Valid To: 2024 Mar 31 1800 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Mar 30 2224 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 30 2101 UTC
Maximum Time: 2024 Mar 30 2116 UTC
End Time: 2024 Mar 30 2215 UTC
X-ray Class: M9.4
Location: S13W88
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 30 2116 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 30 2114 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 2112 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 28 2029 UTC
Maximum Time: 2024 Mar 28 2056 UTC
End Time: 2024 Mar 28 2101 UTC
X-ray Class: X1.1
Optical Class: 3b
Location: S14W61
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 2112 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 28 2029 UTC
Maximum Time: 2024 Mar 28 2056 UTC
End Time: 2024 Mar 28 2101 UTC
X-ray Class: X1.1
Optical Class: 3b
Location: S14W61
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 2045 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 28 2041 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 1633 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 28 1540 UTC
Maximum Time: 2024 Mar 28 1556 UTC
End Time: 2024 Mar 28 1603 UTC
X-ray Class: M6.1
Optical Class: 1n
Location: S13W56
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 1600 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 28 1556 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 0645 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 28 0616 UTC
Maximum Time: 2024 Mar 28 0629 UTC
End Time: 2024 Mar 28 0636 UTC
X-ray Class: M7.0
Location: S13W52
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 28 0629 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 28 0627 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 26 0251 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4573
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 26 0900 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 26 0130 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 23 0815 UTC
Maximum Time: 2024 Mar 23 1820 UTC
End Time: 2024 Mar 25 1515 UTC
Maximum 10MeV Flux: 956 pfu
NOAA Scale: S2 - Moderate
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.

Issue Time: 2024 Mar 25 1153 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 553
Valid From: 2024 Mar 23 0617 UTC
Now Valid Until: 2024 Mar 25 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 25 0856 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4571
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 25 2100 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 25 0856 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1861
Valid From: 2024 Mar 23 2036 UTC
Now Valid Until: 2024 Mar 25 1800 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 25 0856 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 512
Valid From: 2024 Mar 24 1435 UTC
Now Valid Until: 2024 Mar 25 1500 UTC
Warning Condition: persistence
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.

Issue Time: 2024 Mar 25 0720 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 25 0643 UTC
Maximum Time: 2024 Mar 25 0643 UTC
End Time: 2024 Mar 25 0645 UTC
Duration: 2 minutes
Peak Flux: 310 sfu
Latest Penticton Noon Flux: 195 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.

Issue Time: 2024 Mar 25 0701 UTC
SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2024 Mar 23 1405 UTC
Maximum Time: 2024 Mar 23 1820 UTC
End Time: 2024 Mar 24 1945 UTC
Maximum 10MeV Flux: 956 pfu
NOAA Scale: S2 - Moderate
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.

Issue Time: 2024 Mar 24 2336 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 552
Valid From: 2024 Mar 23 0617 UTC
Now Valid Until: 2024 Mar 25 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Comment: This is an extension of the 10 MeV > 10pfu (S1) warning condition in response to continued flux above the S1 threshold.
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 24 1907 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Mar 24 1903 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
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.

Issue Time: 2024 Mar 24 1843 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 24 1840 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 24 1629 UTC
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2024 Mar 24 1628 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

Issue Time: 2024 Mar 24 1547 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2024 Mar 24 1546 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong
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.

Issue Time: 2024 Mar 24 1543 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2024 Mar 24 1543 UTC
Valid To: 2024 Mar 25 0600 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
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.

Issue Time: 2024 Mar 24 1531 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Mar 24 1526 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
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.

Issue Time: 2024 Mar 24 1517 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 24 1516 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 24 1502 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2024 Mar 24 1437 UTC
Deviation: 377 nT
Station: MEA
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.

Issue Time: 2024 Mar 24 1443 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 24 1443 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 24 1434 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4570
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 25 1500 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 24 1434 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1860
Valid From: 2024 Mar 23 2036 UTC
Now Valid Until: 2024 Mar 25 1200 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 24 1434 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Mar 24 1435 UTC
Valid To: 2024 Mar 25 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
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.

Issue Time: 2024 Mar 24 1426 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2024 Mar 24 1430 UTC
Valid To: 2024 Mar 24 1500 UTC
IP Shock Passage Observed: 2024 Mar 24 1411 UTC
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.

Issue Time: 2024 Mar 24 0855 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4569
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 24 2100 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 24 0301 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 24 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 2322 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2024 Mar 23 2320 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
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.

Issue Time: 2024 Mar 23 2224 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1858
Valid From: 2024 Mar 23 2036 UTC
Now Valid Until: 2024 Mar 24 0900 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 23 2223 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4568
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 24 1200 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 23 2220 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2024 Mar 23 2219 UTC
Valid To: 2024 Mar 24 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
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.

Issue Time: 2024 Mar 23 2144 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 23 2144 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 2056 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 23 2055 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 2043 UTC
EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 551
Valid From: 2024 Mar 23 0617 UTC
Now Valid Until: 2024 Mar 24 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 23 2037 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Mar 23 2036 UTC
Valid To: 2024 Mar 24 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 1840 UTC
WATCH: Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Mar 24: G2 (Moderate) Mar 25: G3 (Strong) Mar 26: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2024 Mar 23 1754 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4567
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 24 0600 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 23 1514 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 23 1351 UTC
Maximum Time: 2024 Mar 23 1402 UTC
End Time: 2024 Mar 23 1415 UTC
X-ray Class: M5.3
Optical Class: sf
Location: N21W02
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 23 1430 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2024 Mar 23 1405 UTC
NOAA Scale: S2 - Moderate
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.

Issue Time: 2024 Mar 23 1354 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 23 1352 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 23 1155 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4566
Valid From: 2024 Mar 23 0415 UTC
Now Valid Until: 2024 Mar 23 1800 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 23 0904 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 23 0859 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 0833 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2024 Mar 23 0815 UTC
NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 23 0617 UTC
WARNING: Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2024 Mar 23 0617 UTC
Valid To: 2024 Mar 23 2100 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

Issue Time: 2024 Mar 23 0537 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 23 0536 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 0523 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Mar 23 0523 UTC
Valid To: 2024 Mar 23 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 23 0512 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 23 0512 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
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.

Issue Time: 2024 Mar 23 0414 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 23 0415 UTC
Valid To: 2024 Mar 23 1200 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Mar 23 0233 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2024 Mar 23 0107 UTC
Maximum Time: 2024 Mar 23 0117 UTC
End Time: 2024 Mar 23 0213 UTC
Duration: 66 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 198 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.

Issue Time: 2024 Mar 23 0231 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2024 Mar 23 0058 UTC
Maximum Time: 2024 Mar 23 0133 UTC
End Time: 2024 Mar 23 0222 UTC
X-ray Class: X1.1
Location: N17E03
NOAA Scale: R3 - Strong

Comment: Location is difficult to ascertain with certainty because both Region 3614 and Region 3615 (S13E10) erupted with nearly similar intensity.
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.

Issue Time: 2024 Mar 23 0202 UTC
ALERT: Type II Radio Emission
Begin Time: 2024 Mar 23 0109 UTC
Estimated Velocity: 791 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.

Issue Time: 2024 Mar 23 0119 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 23 0116 UTC
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 22 2013 UTC
WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Mar 23: None (Below G1) Mar 24: None (Below G1) Mar 25: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2024 Mar 22 1155 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4564
Valid From: 2024 Mar 21 0304 UTC
Now Valid Until: 2024 Mar 22 1500 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 22 0855 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4563
Valid From: 2024 Mar 21 0304 UTC
Now Valid Until: 2024 Mar 22 1200 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 21 2102 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 21 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 21 2039 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 1855
Valid From: 2024 Mar 21 1342 UTC
Now Valid Until: 2024 Mar 22 0600 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 21 2028 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4562
Valid From: 2024 Mar 21 0304 UTC
Now Valid Until: 2024 Mar 22 0900 UTC
Warning Condition: Persistence
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.

Issue Time: 2024 Mar 21 1803 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 21 1753 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 21 1442 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2024 Mar 21 1441 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 21 1342 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2024 Mar 21 1342 UTC
Valid To: 2024 Mar 21 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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.

Issue Time: 2024 Mar 21 1340 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2024 Mar 21 1338 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
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.

Issue Time: 2024 Mar 21 1128 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 4561
Valid From: 2024 Mar 21 0304 UTC
Now Valid Until: 2024 Mar 21 2100 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Mar 21 0304 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2024 Mar 21 0304 UTC
Valid To: 2024 Mar 21 1200 UTC
Warning Condition: Onset
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.

Issue Time: 2024 Mar 20 0752 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2024 Mar 20 0723 UTC
Maximum Time: 2024 Mar 20 0736 UTC
End Time: 2024 Mar 20 0747 UTC
X-ray Class: M7.4
Optical Class: 2b
Location: S12E49
NOAA Scale: R2 - Moderate
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.

Issue Time: 2024 Mar 20 0735 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 20 0733 UTC
NOAA Scale: R2 - Moderate
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.

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
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.

Issue Time: 2024 Mar 18 1918 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2024 Mar 18 1916 UTC
NOAA Scale: R2 - Moderate
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.

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
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.

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.
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

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
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

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
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

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
Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

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
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.

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