On this day in 1917, a tornado family moved for 293 miles through Illinois, and Indiana. It was at one time thought to be one tornado; however, Grazulis classified it as a tornado family, with one of the tornadoes an F4, having a 155-mile track (that too is believed to have been at least four separate tornadoes). The worst damage from the tornado was in the Mattoon/Charleston, IL area. 101 people were killed, and at least 638 people were injured. Source.