National Weather Service United States Department of Commerce

Overview

A moist and unstable airmass combined with a front bisecting through the area to produce strong to severe thunderstorms over the lower Ohio Valley during the afternoon and early evening on July 3rd. The most significant damage from the storms was around the Poseyville, IN area where a microburst occurred with winds up to 80 mph estimated. The water vapor content of the atmosphere was quite high, helping to produce very efficient rain-producing thunderstorms and flash flooding in some areas.