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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.
On average, tornadoes kill about 60 people per year--most from flying or falling (crushing) debris. The actual number of tornado deaths in a year can vary wildly -- from single digits to hundreds, depending on many factors from both weather and society.ecause: Nobody knows the true wind speeds at ground level in most tornadoes, and The amount of wind needed to do similar-looking damage can vary greatly, even from block to block or building to building, ...damage rating is (at best) an exercise in educated guessing.