National Weather Service United States Department of Commerce

Overview

During the afternoon and evening of April 18, 2024, discrete supercell thunderstorms developed along a cold front moving through the bi-state area. These storms were initially mainly capable of producing large hail and damaging wind gusts, but become tornadic as additional thunderstorms formed along the front. Due to the additional thunderstorms, storm interaction increased, causing storms to congeal into a Quasi-Linear Convective System (QLCS) that impacted the St. Louis metro area and portions of southwestern Illinois. The QLCS was responsible for several tornadoes and instances of straight line wind damage in this part of the area. Fortunately, no injuries or fatalities were reported with these thunderstorms.

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A map of the tornadoes surveyed as of April 20, 2024
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