G4 (Severe) Geomagnetic Storm Levels Reached 19 Jan, 2026
published: Wednesday, January 21, 2026 17:12 UTC UTC
G4 Levels were first reached at 2:38pm EST (1938 UTC) on 19 January, 2026 upon CME shock arrival. CME passage is expected to continue through the evening with G4 levels remaining possible.