A Supercell Storm Cloud Forming over Wyoming

Explanation: How do supercell storm clouds form? Pictured above is a time-lapse video taken last Sunday detailing the formation of one such violent supercell in eastern Wyoming , USA . Starting as part of a large and dark thunderstorm complex, the supercell comes together along with a large rotating updraft of air known as a mesocyclone . Mesocyclone s form during rapid changes in wind speed and direction with height and can produce torrential rain , damaging hail , swirling winds , and sometimes tornadoes. Storm watchers are seen studying, imaging, and ultimately running from the developing storm cloud during the video. During the middle part of the video, the kilometer-wide supercell can be seen swirling ominously with a nearly flat bottom . Toward the end of the video, another swirling supercell cloud forms but then quickly dissipates.

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