Which is not one of the criteria used to determine whether a thunderstorm is severe or not?

Name: Which is not one of the criteria used to determine whether a thunderstorm is severe or not?
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Question

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Severe thunderstorms are classified based on hail size (1 inch in diameter or larger), wind speeds (58 mph or higher), and the presence of tornadoes. Lightning frequency is not considered in determining whether a thunderstorm is classified as severe.

Which Is Not One of the Criteria Used to Determine