Supercell thunderstorm. A supercell thunderstorm is a severe long-lived storm in which the wind speed and direction changes with height. It comprises a strong rotating updraft of warm air, known as a mesocyclone, and a separate downdraft of cold air. If a tornado forms in the mesocyclone, the storm is classified as a tornadic supercell thunderstorm. Photographed in South Dakota, USA.
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