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Why some storms turn into tornadoes

The Supercell Foundation Not all thunderstorms can produce tornadoes - only about 30% of supercell thunderstorms actually ...
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60 years ago this year, a mile-wide tornado cut into South Dakota

COLOME, S.D. — The most powerful tornado in South Dakota history, which cut through Tripp County on Saturday, May 8, 1965, and spun winds over 200 miles per hour, spawned from a storm just south of ...