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Supercell thunderstorm over fields, USA Featured Extreme Weather Image

Supercell thunderstorm over fields, USA

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. This was the most prolific supercell thunderstorm of 2009. The storm was over 30 miles (48 kilometres) wide and persisted for 9 hours. Photographed near Valentine, Nebraska, USA, on 13th July 2009