NOAA Issues G4 ‘Severe’ Geomagnetic Storm Watch for Nov. 12 After X5.1 Solar Flare — Northern Lights Possible as Far South as Indiana Tonight (Nov. 11)
Published: November 11, 2025 Key takeaways What changed today (Nov. 11) NOAA’s Space Weather Prediction Center (SWPC) posted a G4 (Severe) watch for Nov. 12, citing multiple coronal mass ejections (CMEs) now en route — including the most energetic, linked to today’s X5.1 flare that peaked at 10:04 UTC (5:04 a.m. EST). The agency says the latest CME appears partial‑halo and fast, and while forecast timing remains uncertain, confidence is high that Earth will catch at least a glancing blow. Space Weather Prediction Center NOAA’s 3‑Day Forecast (issued 18:40 UTC) backs up the upgrade with a Kp breakdown that reaches