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Hook echo

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A hook echo on the radar image of the May 3, 1999 supercell thunderstorm that produced an F5 tornado in Moore, Oklahoma.

A hook echo is a hook shape seen on a weather radar of some supercell thunderstorms. It is produced by rain, hail, or even debris wrapping around the thunderstorm.[1] A hook echo is a sign that a tornado has formed or is forming. If a hook echo is seen on radar, the National Weather Service may issue a tornado warning.[2]


  1. Glickman, Todd S., ed. (2000). Glossary of Meteorology (2nd ed.). American Meteorological Society. ISBN 978-1-878220-34-9 . 
  2. Angel, Jim (Apr 9, 2013). "ISWS is Pioneer in Tracking Tornadoes by Radar". Illinois State Water Survey. Retrieved 2013-05-22.