On Monday evening, Oct. 3, through Tuesday night, multiple CMEs will arrive, increasing the odds that the aurora will start early and stay late. So you know, we had a similar forecast last weekend for a G2 storm that sadly never materialized. The aurora can be like that. Sometimes it shows up earlier than expected — when it's still daylight over North America — or hours late. Just be prepared.
MULTIPLE CMES ARE COMING: NOAA forecasters say there is a chance of G2-class geomagnetic storms on Oct. 4th when multiple CMEs might sideswipe Earth's magnetic field. Most of the incoming CMEs were hurled into space by sunspot AR3110, which unleashed a series of strong flares (M5.9, M8.7, X1) over the weekend. During G2-class storms, naked-eye auroras can descend into the United States as low as New York and Idaho.