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Tornadic supercell thunderstorm
Tornadic supercell thunderstorm (right) with mammatus clouds (left). Mammatus clouds may be a sign that a tornado is developing. Supercell thunderstorms are severe long-lived storms within which the wind speed and direction changes with height. This produces a strong rotating updraft of warm air (a mesocyclone) as well as a separate downdraft of cold air. Around a third of supercells produce tornadoes and are termed tornadic. Photographed near Bowdle, South Dakota, USA, on 22 May 2010.
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