Shae Cohan photographed these sprites on August 26. Sprites are electrical discharges that occur above thunderstorms, typically at an altitude of 30 to 55 miles. The picture was taken from Macomb, although the storms in question were southeast of Springfield near Taylorville. (click image to enlarge)
A large, killer tornado spun a path of destruction across Kendall and Will Counties in northeast Illinois. This F5 tornado was on the ground for over 16 miles, touching down first near Oswego and lifting 20 minutes later in Joliet. The worst damage occurred in the towns of Plainfield and Crest Hill. 29 people were killed, and another 350 were injured. Total damage was estimated around $165 million. Before the tornado developed, the severe thunderstorm produced wind gusts in the 80-100 mph range.