This is a rare anticyclonic tornado that occured in 2003 in South Dakota. This was one of 10 tornadoes that spawned from one supercell south of Sioux Falls. According to Wikipedia, only one out of 50 tornadoes are anticyclonic. Author: aprwx Keywords: tornado anticyclonic funnel south dakota sioux falls supercell thunderstorm storm chaser chasing andrew revering Added: May 10, 2008
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