Торнадо

A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
Tornadoes are capable of inflicting extreme damage.

The destructive power of a tornado

Characteristic of climate of the USA are frequent tornadoes.
The tornado occurs in the USA because there is a lot of flat district.

Classification of tornadoes :
Bichepodobnye
Indistinct
Compound
Fiery
Water
Earth
Snow