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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.
cause of 70% of all tornado deaths. These tornadoes can exceed one hour in length, with winds greater than 205 miles per hour. There are many myths surrounding tornadoes and tornado safety. One is that areas near rivers, lakes, and mountains are safe form tornadoes. The fact is no place is safe from tornadoes.