ROGER HILL / SCIENCE PHOTO LIBRARY ROGER HILL / SCIENCE PHOTO LIBRARY
Tornadic supercell thunderstorm over fields. 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. Photographed near Gove, Kansas, USA, on 31st July 2009.
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