Weather Dictionary / Glossary of Terms

Severe Thunderstorm


   Weather TermDescription / Definition
   Severe Thunderstorm A thunderstorm that produces a tornado, winds of at least 58 mph (50 knots), and/or hail at least ¾" in diameter. Structural wind damage may imply the occurrence of a severe thunderstorm. A thunderstorm wind equal to or greater than 40 mph (35 knots) and/or hail of at least ½" is defined as approaching severe.


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Data courtesy of NOAA - National Oceanic and Atmospheric Administration