Severe G4 Geomagnetic Storm Is Lighting Up U.S. Skies — Northern Lights Could Return Tonight (Nov. 12, 2025) NOAA confirms a severe storm; where and when to look, what’s driving it, and what it can affect
Key points NOAA: Severe storm confirmed, more to come The National Oceanic and Atmospheric Administration’s Space Weather Prediction Center (SWPC) reported that G4 (Severe) geomagnetic storm conditions were observed at 01:20 UTC on Wednesday, Nov. 12 (8:20 p.m. ET Tuesday). The agency says geomagnetic activity is expected to continue into the night. NOAA Space Weather Prediction Center SWPC placed Geomagnetic Storm Watches for this multi-day event: G2 (Moderate) for Nov. 11, G4 (Severe) for Nov. 12, and G3 (Strong) for Nov. 13, tied to a train of CMEs that erupted from the Sun between Nov. 9 and early Nov. 12.