EF1 tornado in Grant County, South Dakota

The south to north tornado track started south of 156th St along 482nd Ave where a farm exhibited clear tornado damage which included mangled trees, barn roof damage, barn doors split in half, residential roof and siding damage and a camper completely destroyed. The track would continue roughly three miles north in the vicinity of 153rd St. Another farm would sustain damage, with tops of trees missing in one shelterbelt and uprooted and snapped trees in a second shelterbelt. The dormer of the residence was ripped off and landed 85 to 100 yards from the house in a northeast direction. North of this property a dairy farm had a machine shed with collapsed walls. This farm was housing dairy cattle that were transported from the Estelline area after a May 12 tornado destroyed barns on that property. The last indication of the tornado track was through a shelter belt a quarter mile north of 153rd St.

Storms redeveloped in the late morning, with supercell characteristics across eastern South Dakota producing up to one inch diameter hail and winds of 70 mph, in addition to 6 confirmed tornadoes, one of which was rated EF3. Heavy rain also occurred with this system, with the greatest amount of rainfall measured by a CoCoRaHS observer being 4.69 inches measured near Columbia, and the highest COOP observer report coming out of Milbank with a two day total of 2.86. This heavy rain resulted in flooding in several rural locations but also included parts of Watertown and Aberdeen.