National Weather Service United States Department of Commerce


Slow moving, repeat thunderstorms produced widespread heavy rainfall across portions of southeast South Dakota into southwest Minnesota the evening of Wednesday, September 11th into the early morning hours of Thursday, September 12th. Rainfall amounts across a large area ranged from 3 to 8 inches. Looking at the 48 hour rainfall totals from late Tuesday September 10th through the morning of Thursday, September 12th, a band of extreme rainfall fell from Mitchell, SD to Madison, SD to Slayton, MN, where 6 to 12 inches accumulated. 

This rainfall resulted in significant flash flooding, requiring evacuations in some communities and many water rescues. As the water moved into the river system, major to record flooding occurred at numerous locations. Many structures were inundated with water. In addition, damage to area roads was significant and widespread. Of note, Interstate 90 from Sioux Falls to Mitchell, SD was closed for an extended period due to flooding. 

Updates will be posted as additional information becomes available. 

48 Hour Rainfall Ending September 12, 2019
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