EF0 tornado in Pulaski County, Illinois

The tornado was very weak as it touched down along the Ohio River. In this area, trees were uprooted, and a few trees were snapped. At a campground east of Grand Chain, several campers were damaged, and one was overturned. Peak winds were estimated near 70 mph. The tornado remained weak as it crossed into Massac County.

Numerous strong to severe thunderstorms occurred in the warm sector of a low pressure system over central Missouri. The air mass in the warm sector was very unstable, with afternoon mixed-layer cape values in the 2500 to 4000 j/kg range. A 65 to 75 knot mid level jet was located across Arkansas, with the nose of the jet moving into western Kentucky. This feature enhanced the lift and strong deep-layer shear already in place, creating an environment very favorable for supercells and tornadoes. A 40 to 55 knot low level jet across eastern Arkansas moved into western Kentucky during the evening, resulting in isolated tornadoes and widespread damaging winds.