Bats encountering supercell thunderstorm with hook echo indicative of tornado. Del Rio,Texas. March 19,2006. The hook echo is one of the classical hallmarks of tornado-producing supercell thunderstorms as seen on a weather radar. The echo is produced by rain,hail,or even debris being wrapped around the supercell. The National Weather Service considers the presence of a hook echo as sufficient to justify issuing a tornado warning. A supercell is a thunderstorm that is characterized by the presence of a mesocyclone: a deep,continuously-rotating updraft | |
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