http://www.spaceweather.com

A strong solar wind disturbance hit our planet's magnetosphere between 1300 and 1400 UT (9 to 10 a.m. EDT) on Wednesday, April 11th, triggering a severe geomagnetic storm. If the storm continues unabated, middle-latitude sky watchers could spot auroras tonight. Usually the best time to look for "Northern Lights" is around local midnight. In this case, it might be better to go outside not too long after sunset - before the storm subsides and before the bright Moon rises. Visit spaceweather.com for updates and images from the ongoing storm.

NOTE: Some subscribers may have received an earlier version of this announcement citing an incorrect time for the onset of the geomagnetic storm. This updated notice is correct.