EF1 tornado in Gibson County, Indiana

The tornado crossed from Wabash County, Illinois into Gibson County. The tornado affected only a small corner of Gibson County between East Mt. Carmel and the White River. Several large trees were blown down. The peak rating in the Gibson County portion of the track was EF-1. The tornado then crossed the White River into Knox County, Indiana, where it paralleled the Gibson County line near the White River to U.S. Highway 41 and beyond.

Two rounds of severe thunderstorms occurred. The first round during the mid afternoon hours was associated with a surge of higher dew points northward. Storms erupted along this effective front over southwest Indiana, which was beneath a region of warm moist wind flow at 850 mb. Very large hail accompanied a few of these storms. The second round was an organized complex of thunderstorms that accompanied a pronounced mesoscale convective vortex (MCV) that tracked across Missouri and Illinois. A corridor of moderate to strong instability formed ahead of the MCV from southern Missouri into southern Illinois and Indiana. After a brief lull over Illinois, the storms redeveloped during the evening over the Wabash Valley region as a small cluster with an embedded supercell. The supercell produced a tornado that tracked into southwest Indiana.