JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Supercell thunderstorm. A supercell thunderstorm is a severe long-lived storm within which the wind speed and direction changes with height. This produces 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 Oklahoma, USA.
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