Local 4/19/2026, 7:47:15 PM
UTC 2026-04-19T19:47:15.250Z
Space Weather Message Code: ALTEF3Serial Number: 3679Issue Time: 2026 Apr 19 1947 UTCALERT: Electron 2MeV Integral Flux exceeded 1000pfuThreshold Reached: 2026 Apr 19 1920 UTCStation: GOES19Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Local 4/19/2026, 9:00:54 AM
UTC 2026-04-19T09:00:54.210Z
Space Weather Message Code: ALTK06Serial Number: 714Issue Time: 2026 Apr 19 0900 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Apr 19 0859 UTCSynoptic Period: 0600-0900 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 4/19/2026, 8:49:33 AM
UTC 2026-04-19T08:49:33.523Z
Space Weather Message Code: WARK05Serial Number: 2227Issue Time: 2026 Apr 19 0849 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2226Valid From: 2026 Apr 18 2348 UTCNow Valid Until: 2026 Apr 19 1800 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 4/19/2026, 8:49:33 AM
UTC 2026-04-19T08:49:33.517Z
Space Weather Message Code: WARK06Serial Number: 655Issue Time: 2026 Apr 19 0849 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Apr 19 0848 UTCValid To: 2026 Apr 19 1500 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 4/19/2026, 8:49:33 AM
UTC 2026-04-19T08:49:33.510Z
Space Weather Message Code: WARK04Serial Number: 5321Issue Time: 2026 Apr 19 0849 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5320Valid From: 2026 Apr 18 0157 UTCNow Valid Until: 2026 Apr 19 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 4/19/2026, 6:50:21 AM
UTC 2026-04-19T06:50:21.947Z
Space Weather Message Code: ALTK05Serial Number: 2011Issue Time: 2026 Apr 19 0650 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 19 0650 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.
Local 4/19/2026, 6:04:37 AM
UTC 2026-04-19T06:04:37.593Z
Space Weather Message Code: ALTK05Serial Number: 2010Issue Time: 2026 Apr 19 0604 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 19 0559 UTCSynoptic Period: 0300-0600 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 4/19/2026, 6:04:37 AM
UTC 2026-04-19T06:04:37.590Z
Space Weather Message Code: WARK05Serial Number: 2226Issue Time: 2026 Apr 19 0604 UTCEXTENDED WARNING: Geomagnetic K-index of 5 expectedExtension to Serial Number: 2225Valid From: 2026 Apr 18 2348 UTCNow Valid Until: 2026 Apr 19 1200 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 4/19/2026, 6:04:37 AM
UTC 2026-04-19T06:04:37.580Z
Space Weather Message Code: WARK04Serial Number: 5320Issue Time: 2026 Apr 19 0604 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5319Valid From: 2026 Apr 18 0157 UTCNow Valid Until: 2026 Apr 19 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 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 4/18/2026, 11:50:14 PM
UTC 2026-04-18T23:50:14.537Z
Space Weather Message Code: WARK05Serial Number: 2225Issue Time: 2026 Apr 18 2350 UTCWARNING: Geomagnetic K-index of 5 expectedValid From: 2026 Apr 18 2348 UTCValid To: 2026 Apr 19 0900 UTCWarning Condition: OnsetNOAA 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 4/18/2026, 10:46:07 PM
UTC 2026-04-18T22:46:07.617Z
Space Weather Message Code: WARK04Serial Number: 5319Issue Time: 2026 Apr 18 2246 UTCEXTENDED WARNING: Geomagnetic K-index of 4 expectedExtension to Serial Number: 5318Valid From: 2026 Apr 18 0157 UTCNow Valid Until: 2026 Apr 19 1200 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 4/18/2026, 11:24:53 AM
UTC 2026-04-18T11:24:53.590Z
Space Weather Message Code: ALTK05Serial Number: 2009Issue Time: 2026 Apr 18 1124 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 18 1124 UTCSynoptic Period: 0900-1200 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 4/18/2026, 8:25:57 AM
UTC 2026-04-18T08:25:57.307Z
Space Weather Message Code: ALTK06Serial Number: 713Issue Time: 2026 Apr 18 0825 UTCALERT: Geomagnetic K-index of 6Threshold Reached: 2026 Apr 18 0825 UTCSynoptic Period: 0600-0900 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 4/18/2026, 7:52:01 AM
UTC 2026-04-18T07:52:01.750Z
Space Weather Message Code: WARK06Serial Number: 654Issue Time: 2026 Apr 18 0752 UTCWARNING: Geomagnetic K-Index of 6 expectedValid From: 2026 Apr 18 0751 UTCValid To: 2026 Apr 18 1500 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 4/18/2026, 7:41:23 AM
UTC 2026-04-18T07:41:23.010Z
Space Weather Message Code: ALTK05Serial Number: 2008Issue Time: 2026 Apr 18 0741 UTCALERT: Geomagnetic K-index of 5Threshold Reached: 2026 Apr 18 0740 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.