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Quick Answer. Tornadoes can last from a few seconds to over an hour, although most last less than 10 minutes. They form from mesocyclones, which are areas of organized rotation within supercell thunderstorms. Scientists still don't know why some mesocyclones become tornadoes and some do not.
Americaâs worst tornadoes occur in the Midwest and southern Great Plains states. Last year, 35 people were killed and 230 injured by tornadoes nationwide. The worst was the tornado that hit Moore, Okla., on May 5, which killed 24 people.