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What is a supercell thunderstorm?

A supercell thunderstorm is a long-lived thunderstorm whose updrafts and downdrafts are in near balance.

These storms have the greatest tendency to produce tornadoes that stay on the ground for long periods of time.

Supercell thunderstorms can produce violent tornadoes with winds exceeding 200 mph.

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Allentown, PA 18102





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