To be rated a severe thunderstorm by the National Weather Service, the storm has to have at least one of the following: large hail with a diameter of at least three-quarters of an inch, surface wind gusts of 40 knots or greater, or produces a tornado.

Question

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To be rated as a severe thunderstorm by the National Weather Service, the storm must have at least one of the following: hail one inch in diameter or larger, wind gusts of 58 mph (50 knots) or greater, or produce a tornado.

To Be Rated a Severe Thunderstorm by the National Weather