National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rains Across Portions of the Central and Eastern US; Heat Expands to Portions of the East

Widespread showers and thunderstorms, some severe, may produce heavy downpours and flash flooding across much of the eastern and central U.S. Dangerous heat will continue in the Pacific Northwest and expand across portions of the East. Deep tropical moisture and associated thunderstorms will bring heavy rainfall and localized flash flooding across portions of Florida into the central Gulf Coast. Read More >

Overview

A warm front lifted north across the region, providing the necessary lift for thunderstorms to ignite in a warm, moist, unstable airmass. Due to a strong cap (warm air aloft about 10,000 feet up), storms didn't take off until the evening into the overnight hours. With the orientation of the boundary parallel to the mid level wind flow, the stage was set for training of thunderstorms over the same areas of southeast Missouri, southern Illinois, and southwest Indiana. Flash flooding and hail were the most common reports from this event.
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