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)
September of 1918 was the coldest September on record in much of central Illinois. Average temperatures of 58.2 degrees at Peoria, 58.6 degrees in Champaign and 60.4 degrees in Springfield still stand as records for these locations.