Local 2/21/2026, 9:53:58 AM
UTC 2026-02-21T09:53:58.233Z
Space Weather Message Code: WATA20Serial Number: 1097Issue Time: 2026 Feb 21 0953 UTCWATCH: Geomagnetic Storm Category G1 PredictedHighest Storm Level Predicted by Day:Feb 21: None (Below G1) Feb 22: None (Below G1) Feb 23: G1 (Minor)THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECTNOAA 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 2/20/2026, 11:40:47 PM
UTC 2026-02-20T23:40:47.420Z
Space Weather Message Code: ALTK04Serial Number: 2633Issue Time: 2026 Feb 20 2340 UTCALERT: Geomagnetic K-index of 4Threshold Reached: 2026 Feb 20 2340 UTCSynoptic Period: 2100-2400 UTCActive Warning: YesNOAA 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 2/20/2026, 11:27:17 PM
UTC 2026-02-20T23:27:17.327Z
Space Weather Message Code: WARK04Serial Number: 5264Issue Time: 2026 Feb 20 2327 UTCWARNING: Geomagnetic K-index of 4 expectedValid From: 2026 Feb 20 2327 UTCValid To: 2026 Feb 21 1200 UTCWarning Condition: OnsetNOAA 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 2/20/2026, 7:16:23 AM
UTC 2026-02-20T07:16:23.497Z
Space Weather Message Code: ALTEF3Serial Number: 3631Issue Time: 2026 Feb 20 0716 UTCCONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfuContinuation of Serial Number: 3630Begin Time: 2026 Feb 16 1635 UTCYesterday Maximum 2MeV Flux: 3261 pfuPotential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.