EF2 tornado in Posey County, Indiana

This long-track tornado continued from White County, Illinois across the Wabash River into Posey County. The tornado was rated EF-2 throughout its path in Posey County. The tornado was about 220 yards wide when it crossed the Wabash River to Indiana Highway 69. Several small barns were destroyed, and most trees were snapped along the path. Power poles were snapped, and roads were blocked by debris. The Posey County portion of the path was almost entirely through agricultural land, resulting in damage to very few residences. The tornado crossed Interstate 64 west of Poseyville, leaving a path of flattened trees across the interstate. Just before the tornado crossed into Gibson County, an old house was shifted off its foundation. The tornado again strengthened to EF-3 intensity after crossing into Gibson County.

An isolated but very powerful supercell thunderstorm moved across southwest Indiana during the late evening hours. The storm originated over Missouri in a destabilizing pre-frontal air mass characterized by dew points in the lower to mid 60's. This intense supercell storm awaited the approach of a mid-level impulse from Oklahoma, which was downstream from the primary shortwave trough over the Plains. A southwesterly low-level jet increased substantially during the evening. A long-track, strong tornado was spawned in southeast Illinois, and it continued east-northeast for about 45 miles before lifting in eastern Gibson County, Indiana.