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.
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
The largest tornadoes for all history of supervision occurred in the State of Oklahoma of the United States of America during a tornado series in the second half of May, 2013 Wind speed in it reached 322 km/h, diameter of a funnel about 3 km.