Tornadoes or tornado.

Twister (synonyms - tornadoes, thrombus, meso-cyclone) - is a very powerful spinning vortex with a horizontal size of less than 50 km and vertically less than 10 km with a hurricane wind speeds over 33 m / s. The energy of a typical tornado radius of 1 km and an average speed of 70 m / s is the reference energy of the atomic bomb of 20 kilotons of TNT in, similar to the first atomic bomb exploded during testing US "Trinity" in New Mexico on July 16 1945.