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.

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