http://www.newsweek.com/northern-lights-aurora-geomagnetic-storm-1796189

A gorgeous light show could be seen in the night sky over much of North America on Sunday night, with the aurora borealis visible as far south as California.

These spectacular displays appeared as a result of "severe" G4-class geomagnetic storm in the Earth's atmosphere, triggered by a coronal mass ejection (CME) from the sun, the National Oceanic and Atmospheric Administration (NOAA) Space Weather Predictions Center (SWPC) stated.