EF1 tornado in Boone County, Illinois

This tornado touched down southwest of the village of Caledonia moving through mostly farmland along its northeastward track. The storm destroyed numerous outbuildings, heavily damaged a silo, and caused a grain bin to collapse. In the Candlewick Lake neighborhood southeast of Caledonia, a few homes sustained roof and siding damage. Several trees were also damaged. The tornado then crossed into the village of Sharon in southwestern Walworth County, Wisconsin. The storm would go on for nearly another four miles mostly doing damage to barns and trees before lifting near Town Hall Rd and Chilson Rd.

During the afternoon and evening of the 31st, a wave of severe thunderstorms produced numerous tornadoes, severe hail, extensive wind damage, and localized flooding across northern and northeastern Illinois. A total of 37 tornadoes were confirmed across the state. The NWS Chicago office tied a record for the most tornadoes to occur in a single calendar day within the office's county warning area with 22, 17 of which occurred in Illinois. One EF-2 tornado occurred in south-central Lee County and two others in northwest Indiana. Some of the more notable damage includes multiple semi trucks blown over, a garage that had been completely destroyed southeast of Amboy, and the partial roof collapse of the Apollo Theatre in Belvidere which unfortunately resulted in one fatality and 40 injuries.