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hook echo
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hook echo
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hook echo

meteorology
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hook echo
hook echo Hook echo of a tornado in Champaign, Ill., photographed on a radar scope on April 9, 1953. This was the first occasion on which the hook echo, an important clue in the tornado warning system, was recorded.

A "hook echo" is a specific radar signature observed in meteorology, primarily associated with severe thunderstorms that may produce tornadoes. It appears as a hook-shaped area of precipitation wrapping around a storm's updraft. This visual cue on weather radar, detected by systems like the Doppler radar, indicates rotation within the thunderstorm, known as a mesocyclone. While historically, forecasters inferred rotation from hook echoes, modern Doppler radars can directly measure wind speeds and detect the mesocyclone, significantly improving tornado prediction and warning times.1

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2 Britannica Sources
  1. tornado - Prediction and detection of tornadoes
  2. tornado - The mesocyclone

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