Tornadoes are rapidly spinning funnel clouds that reach from thunderstorm clouds to the ground, causing mass destruction with winds that can send cars flying and destroy homes and buildings. They form when hot and cold air masses collide and start circulating intensely, with the force eventually producing a funnel. Some of the most destructive tornadoes include the 1953 Flint Beecher tornado in Michigan, which killed over 100 people and injured 900 with 100 mph winds that destroyed 20 homes.