JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Storm chasers documenting a tornadic supercell thunderstorm in South Dakota, USA. 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. When a tornado forms in the mesocyclone, as in this case, the storm is classified as a tornadic supercell thunderstorm.
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