Overview
- NOAA’s Space Weather Prediction Center posted a G2 watch for Nov. 11 and a rare G4 (Severe) watch for Nov. 12, followed by a G3 watch for Nov. 13, as successive CMEs approach.
- Forecasts cite peak activity late Tuesday night into early Wednesday UTC, with Kp values up to about 7.3 and the strongest window likely overnight Nov. 11–12.
- Aurora visibility could extend across much of the northern U.S. and parts of the lower Midwest—potentially reaching 22 states—and across northern UK under clear skies.
- Forecasters warn of brief disruptions to HF radio, GPS and satellites and note potential power‑grid impacts during stronger phases, though operators have mitigation plans.
- UK Met Office alerts highlight best chances in northern Scotland and Northern Ireland, with cloud cover and moonlight limiting views elsewhere and timing dependent on how the CMEs interact, possibly even merging.