4th of July Geomagnetic Storm

Source - Space Weather News for July 4-5, 2015: http://spaceweather.com

A solar wind stream hit Earth's magnetic field on July 4th, sparking a moderately strong (G2-class) geomagnetic storm.  High-latitude sky watchers who receive this email before sunrise on July 5th should be alert for auroras. The hours around local midnight are usually the best times to look. 

Check http://spaceweather.com for updates.