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.
Local 4/3/2026, 11:10:11 PM
UTC 2026-04-03T23:10:11.837Z
Space Weather Message Code: WARK06Serial Number: 653Issue Time: 2026 Apr 03 2310 UTCEXTENDED WARNING: Geomagnetic K-Index of 6 expectedExtension to Serial Number: 652Valid From: 2026 Apr 03 1551 UTCNow Valid Until: 2026 Apr 04 0600 UTCWarning Condition: PersistenceNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 11:10:11 PM
UTC 2026-04-03T23:10:11.817Z
Space Weather Message Code: ALTK06Serial Number: 712Issue Time: 2026 Apr 03 2310 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Apr 03 2303 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 9:41:04 PM
UTC 2026-04-03T21:41:04.000Z
Space Weather Message Code: ALTK05Serial Number: 2005Issue Time: 2026 Apr 03 2141 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 03 2140 UTCSynoptic Period: 2100-2400 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 4/3/2026, 9:02:39 PM
UTC 2026-04-03T21:02:39.527Z
Space Weather Message Code: WARK04Serial Number: 5310Issue Time: 2026 Apr 03 2102 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5309Valid From: 2026 Apr 02 0047 UTCNow Valid Until: 2026 Apr 04 2359 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 4/3/2026, 9:01:33 PM
UTC 2026-04-03T21:01:33.987Z
Space Weather Message Code: ALTK06Serial Number: 711Issue Time: 2026 Apr 03 2101 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Apr 03 2059 UTCSynoptic Period: 1800-2100 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 9:01:33 PM
UTC 2026-04-03T21:01:33.963Z
Space Weather Message Code: WARK05Serial Number: 2222Issue Time: 2026 Apr 03 2101 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2221Valid From: 2026 Apr 02 0230 UTCNow Valid Until: 2026 Apr 04 1500 UTCWarning Condition: PersistenceNOAA 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 4/3/2026, 7:08:43 PM
UTC 2026-04-03T19:08:43.663Z
Space Weather Message Code: ALTK05Serial Number: 2004Issue Time: 2026 Apr 03 1908 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 03 1906 UTCSynoptic Period: 1800-2100 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 4/3/2026, 4:47:26 PM
UTC 2026-04-03T16:47:26.220Z
Space Weather Message Code: ALTK07Serial Number: 216Issue Time: 2026 Apr 03 1647 UTCALERT: Geomagnetic K-index of 7Threshold Reached: 2026 Apr 03 1646 UTCSynoptic Period: 1500-1800 UTCActive Warning: YesNOAA Scale: G3 - StrongNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 4:25:08 PM
UTC 2026-04-03T16:25:08.373Z
Space Weather Message Code: WARK07Serial Number: 148Issue Time: 2026 Apr 03 1625 UTCWARNING: Geomagnetic K-index of 7 or greater expectedValid From: 2026 Apr 03 1625 UTCValid To: 2026 Apr 03 2359 UTCWarning Condition: OnsetNOAA Scale: G3 or greaterNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 3:55:55 PM
UTC 2026-04-03T15:55:55.093Z
Space Weather Message Code: ALTK06Serial Number: 710Issue Time: 2026 Apr 03 1555 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Apr 03 1555 UTCSynoptic Period: 1500-1800 UTCActive Warning: YesNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 3:52:05 PM
UTC 2026-04-03T15:52:05.490Z
Space Weather Message Code: WARK06Serial Number: 652Issue Time: 2026 Apr 03 1552 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Apr 03 1551 UTCValid To: 2026 Apr 03 2359 UTCWarning Condition: OnsetNOAA Scale: G2 - ModerateNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanationPotential 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.
Local 4/3/2026, 3:45:12 PM
UTC 2026-04-03T15:45:12.670Z
Space Weather Message Code: SUMSUDSerial Number: 298Issue Time: 2026 Apr 03 1545 UTCSUMMARY: Geomagnetic Sudden ImpulseObserved: 2026 Apr 03 1529 UTCDeviation: 72 nTStation: HADNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 4/3/2026, 3:42:14 PM
UTC 2026-04-03T15:42:14.950Z
Space Weather Message Code: ALTK05Serial Number: 2003Issue Time: 2026 Apr 03 1542 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 03 1535 UTCSynoptic Period: 1500-1800 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 4/3/2026, 3:29:23 PM
UTC 2026-04-03T15:29:23.420Z
Space Weather Message Code: WARSUDSerial Number: 253Issue Time: 2026 Apr 03 1529 UTCWARNING: Geomagnetic Sudden Impulse expectedValid From: 2026 Apr 03 1529 UTCValid To: 2026 Apr 03 1550 UTCIP Shock Passage Observed: 2026 Apr 03 1503 UTCNOAA Space Weather Scale descriptions can be found atwww.swpc.noaa.gov/noaa-scales-explanation
Local 4/3/2026, 2:51:54 PM
UTC 2026-04-03T14:51:54.773Z
Space Weather Message Code: WARK05Serial Number: 2221Issue Time: 2026 Apr 03 1451 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2220Valid From: 2026 Apr 02 0230 UTCNow Valid Until: 2026 Apr 03 2359 UTCWarning Condition: PersistenceNOAA 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 4/3/2026, 9:36:25 AM
UTC 2026-04-03T09:36:25.380Z
Space Weather Message Code: ALTEF3Serial Number: 3664Issue Time: 2026 Apr 03 0936 UTCALERT: Electron 2MeV Integral Flux exceeded 1000pfuThreshold Reached: 2026 Apr 03 0920 UTCStation: GOES19Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 4/3/2026, 8:31:35 AM
UTC 2026-04-03T08:31:35.720Z
Space Weather Message Code: ALTK05Serial Number: 2002Issue Time: 2026 Apr 03 0831 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 03 0830 UTCSynoptic Period: 0600-0900 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.