Local 4/5/2026, 5:07:42 AM
UTC 2026-04-05T05:07:42.053Z
Space Weather Message Code: ALTEF3Serial Number: 3666Issue Time: 2026 Apr 05 0507 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3665Begin Time: 2026 Apr 03 0920 UTCYesterday Maximum 2MeV Flux: 2419 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 4/5/2026, 2:48:33 AM
UTC 2026-04-05T02:48:33.723Z
Space Weather Message Code: WARK04Serial Number: 5312Issue Time: 2026 Apr 05 0248 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5311Valid From: 2026 Apr 02 0047 UTCNow Valid Until: 2026 Apr 05 0900 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/4/2026, 11:56:54 PM
UTC 2026-04-04T23:56:54.047Z
Space Weather Message Code: WARK04Serial Number: 5311Issue Time: 2026 Apr 04 2356 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5310Valid From: 2026 Apr 02 0047 UTCNow Valid Until: 2026 Apr 05 0300 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/4/2026, 11:58:02 AM
UTC 2026-04-04T11:58:02.247Z
Space Weather Message Code: ALTEF3Serial Number: 3665Issue Time: 2026 Apr 04 1158 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3664Begin Time: 2026 Apr 03 0920 UTCYesterday Maximum 2MeV Flux: 4465 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 4/4/2026, 2:54:27 AM
UTC 2026-04-04T02:54:27.627Z
Space Weather Message Code: ALTK05Serial Number: 2006Issue Time: 2026 Apr 04 0254 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 04 0248 UTCSynoptic Period: 0000-0300 UTCActive Warning: YesNOAA Scale: G1 - MinorNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/4/2026, 1:46:30 AM
UTC 2026-04-04T01:46:30.047Z
Space Weather Message Code: SUMXM5Serial Number: 312Issue Time: 2026 Apr 04 0146 UTCSUMMARY: X-ray Event exceeded M5Begin Time: 2026 Apr 04 0107 UTCMaximum Time: 2026 Apr 04 0117 UTCEnd Time: 2026 Apr 04 0123 UTCX-ray Class: M7.5Location: N04W04NOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/4/2026, 1:17:22 AM
UTC 2026-04-04T01:17:22.690Z
Space Weather Message Code: ALTXMFSerial Number: 522Issue Time: 2026 Apr 04 0117 UTCALERT: X-Ray Flux exceeded M5Threshold Reached: 2026 Apr 04 0117 UTCNOAA Scale: R2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.