Radar images of tornadic thunderstorm near Delmont, South Dakota

 Radar reflectivity image around 531 pm, September 16, 2006. Radar storm relative motion image around 531 pm, September 16, 2006.

A thunderstorm developed near the Nebraska and South Dakota state line south of Bonesteel, South Dakota.  This storm moved rapidly northeast and organized into a supercell as it moved across Charles Mix County and into Douglas County.  Up to softball size hail occurred across both counties causeing damage to cars and houses.  Around 5:35 pm CDT, a tornado touched down 2 miles southwest of Delmont, South Dakota.  No damage was reported with the tornado.  The radar images above, from 5:31 pm CDT, show a hook echo over extreme southern Douglas County.  The storm relative motion shows a strong rotation in the same location.  This storm continued to move northeast into Hutchinson County and produced an F0 tornado near Parkston 10 minutes later.

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