A supercell is a severe thunderstorm with a deep, continuously rotating updraft (a mesocyclone). Of the four classifications of thunderstorms (supercell, single-cell, multi-cell, and squall line), supercells are the largest and most severe.
Supercells are usually found isolated from other thunderstorms, although they can sometimes be embedded in a squall line. Because they can last for hours, they are known as quasi-steady-state storms. [blah blah blah ...]
Supercells can occur anywhere in the world under the right pre-existing weather conditions. According to some, the first storm to be identified as such was the Wokingham storm over England, which was studied by Keith Browning and Frank Ludlam in 1962. Supercells are most frequent in the Great Plains of the United States, but occasionally occur in many mid-latitude regions.
[with comments] [the initial 'photo' obviously a PhotoChopped mirroring]
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