Supercell

A thunderstorm with a persistent rotating updrafts. Supercells are rare, but are responsible for a remarkably high percentage of severe weather events - especially tornadoes, extremely large hail and damaging straight-line winds.

They frequently travel to the right of the main environmental winds. Visual characteristics often include a rain-free base, tail cloud, flanking line, overshooting top, and back-sheared anvil, all of which normally are observed in or near the right rear or southwest part of the storm. Storms exhibiting these characteristics often are called classic supercells.