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)
Scattered thunderstorms developed along an outflow boundary across northwest Illinois, in a moist to near tropical atmosphere. A lone storm developed into a supercell across Bureau County, and produced hail up to baseball size. In Princeton, a car dealership had 400 of its 500 cars damaged by the storm.
A strong tornado, which contained peak winds near 160 mph, struck between Joppa and the Metropolis airport in extreme southern Illinois. The damage path started about a mile from the Ohio River, where F1 winds uprooted numerous trees. As the tornado crossed U.S. Highway 45 near Joppa Road, a barn was destroyed. The tornado then strengthened to F3 intensity, destroying a log home. The roof and an exterior wall of the well-constructed log home were blown about 1/2 mile.Another house nearby sustained major damage. Four mobile homes were destroyed, along with garages and outbuildings. Part of a double wide mobile home blew into a church sanctuary. Two people were injured when a mobile home was destroyed. Another tornado moved into far southwest Illinois from Missouri, where it had been at F4 intensity; it produced F2 damage across portions of Jackson County, with estimated winds around 150 mph. In northeast Illinois, a tornado briefly touched down on the Loyola University campus in Chicago, then moved onto Lake Michigan.