Solar flares were released on November 27th (multiple mass coronal ejections), they are headed to Earth and is forecast to produce geomagnetic storms on December 1st.
Space Weather Prediction Center: "With 3 CMEs already inbound, the addition of a 4th, full halo CME has prompted SWPC forecasters to upgrade the G2 Watch on 01 Dec to a G3 Watch.
This faster-moving halo CME is progged to merge with 2 of the 3 upstream CMEs, all arriving at Earth on 01 Dec. G3 (Strong) conditions are now likely on 01 Dec."
