Supercell with mammatus, North Dakota, USA
Supercell thunderstorm with mammatus over the rolling plains of North Dakota, USA. 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. Tornadoes may form in the mesocyclone, in which case the storm is classified as a tornadic supercell thunderstorm. The storms also produce torrential rain and hail. Photographed on 10th June 2021., by ROGER HILL/SCIENCE PHOTO LIBRARY
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