EF1 tornado in Jefferson County, Illinois

Many trees were snapped or uprooted. A hay barn was partially pushed over. An old wooden barn was destroyed. A newer wood-frame equipment shed was nearly destroyed. A house roof was heavily damaged, with loosening of roof decking. In the immediate vicinity of the tornado, straight-line winds from the same storm caused a large tree to fall on the roof of a house. Peak winds were near 110 mph. The average path width was 80 yards.

Thunderstorms organized into a bow echo that produced widespread very damaging winds and isolated tornadoes. A shortwave trough over the central and southern high Plains moved northeast through the Mid-Mississippi Valley into the upper Great Lakes. A surface low attendant to this system moved from west central Missouri northeast to north of St. Louis. The trailing cold front advanced southeast across the Lower Ohio Valley and served as the primary focus for thunderstorms.