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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. 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.
- Glickman, Todd S., ed. (2000). Glossary of Meteorology (2nd ed.). American Meteorological Society. . http://glossary.ametsoc.org/wiki/Hook_echo.
- Angel, Jim (Apr 9, 2013). "ISWS is Pioneer in Tracking Tornadoes by Radar". Illinois State Water Survey. http://www.isws.illinois.edu/hilites/press/130409radar.asp. Retrieved 2013-05-22.