National Weather Service United States Department of Commerce


Severe thunderstorms formed across central South Dakota during the late afternoon. As these storms moved across southeastern South Dakota, they formed into a squall line and produced large hail and damaging winds.  As the storms moved east of I-29, several tornadoes were produced by the storms. One EF-1 tornado went through Hadley, Minnesota and a second EF-1 tornado moved west and south of Rock Rapids, Iowa. Five EF-0 tornadoes also touched down in Nobles, Murray, and Cottonwood Counties in Minnesota.  These tornadoes primarily did damage to crops and trees although a few homes and farm buildings were damaged.  In addition, winds up to 90 mph moved through Okoboji Iowa causing tree damage as well as damage to a few homes and an office building.

Supercell which produced 2 inch hail near Lake Andes.
Supercell which produced 2 inch hail near Lake Andes, SD.
(Julie Weddell)
Map of Warnings Issued Rainfall map Radar Velocity Loop
Summary of Warnings Issued Map of 24-hour Rainfall Shelf Cloud near Mitchell, SD
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