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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.
May is the month with the most tornadoes The peak months for tornadoes is April, May and June. However, the most common month for tornadoes to occur is in May. May is the month with the highest frequency of tornadoes, but the most powerful tornadoes have seemed to occur a bit earlier in the year in April. April is the month when the most rare and gigantic F5 tornadoes happen. April also has the highest average number of deaths from tornadoes.