They can reach windspeeds of up to 379 m.p.h. Most tornadoes are less than half a mile in diameter. A tornado is actually a small violent cyclone. Tornadoes are most likely to form in Tornado Alley which is the midwestern and southwestern part of the United States. While Australia takes second place for the most tornadoes annually.
Tornadoes form more in the United States than anywhere else in the world.
Also tornadoes have killed more people in the United States than anywhere else in the world. The links below will help you learn more information about tornadoes.