Wunderground.com - Nick Wiltgen, 4/24/13
Photographer Roger Hill described this massive rotating thunderstorm as 'the mothership'. He photographed it over Clinton, Okla., on April 22, 2013. (Roger Hill Photography)
Veteran storm chaser and photographer Roger Hill captured images of a spectacular supercell thunderstorm over western Oklahoma on April 22, 2013. (See below for the individual photos.)
A supercell thunderstorm is characterized by a sustained and powerful rotating updraft. These storms originate in unstable air accompanied by a particular type of changing wind direction at various altitudes in the atmosphere; a common combination supportive of supercells is a southerly or southeasterly wind near ground level and a southwesterly or westerly wind higher up in the atmosphere.
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