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.