April 2011 Derecho

Composite display of hourly radar reflectivity imagery, showing development and evolution of the April 4-5, 2011, derecho-producing convective system. Time (CDT) ranges from 7:00 a.m. on Monday, April 4 (1200 UTC April 4, far left) to 7:00 a.m. on Tuesday, April 5 (1200 UTC April 5, far right). Intensity scale (dBZ) at left.

Black weather map of Southeastern U.S. with storms denoted in green and red

Courtesy of the National Oceanic and Atmospheric Administration Storm Prediction Center / Image by G. Carbin