https://spaceweather.com/
STRONG GEOMAGNETIC STORM WATCH: A CME is heading straight for Earth–see below. A NASA model predicts it will strike Earth during the early hours of June 1st. The impact could spark strong (G3-class) geomagnetic storms with auroras at mid-latitudes. CME impact alerts: SMS Text
MAJOR SOLAR FLARE AND HALO CME: Big old sunspot 4100 finally exploded–and it was a doozy. On May 31st at 00:05 UTC, Earth-orbiting satellites detected an M8.2-class solar flare. The explosion lasted more than 3 hours: