BadAstronomer/Phil Plait tweets:
People are reporting incredibly bright aurorae in Canada and northern US. If you live up there, go look!

Northern Lights have spilled across the Canadian border into the contiguous USA. Sighting reports have come from as far south as Arkansas, Wisconsin, Tennessee, Missouri, Nebraska, Kentucky, Indiana, Oklahoma, Kansas, Maryland, Michigan, , New York, Ohio and central California. The display was caused by the CME impact described below.

is.gd/2m84M5