G3 – Strong geomagnetic storm watch in effect for June 8 as CME heads toward Earth

A coronal mass ejection (CME) associated with an M1.8 solar flare from Region 4461 is forecast to arrive around midday UTC on June 8. Forecast calls for G1 - Minor to G2 - Moderate storming on June 8 and early June 9, and isolated G3 - Strong periods on June 8. Source