National Weather Service United States Department of Commerce


Several rounds of thunderstorms moved through the region during the week of September 18 - 21, 2018.  These thunderstorms brought heavy rain to the region, with widespread accumulations between 4 to 7 inches, and localized amounts greater than 10 inches.

In addition to the heavy rain, a quick moving line of thunderstorms during the afternoon and evening hours of September 20th, produced wind damage across portions of northwestern Iowa and southern Minnesota.   A brief tornado was also reported in Superior, IA.  

Heavy rainfall will slowly drain into area streams and rivers, and is producing moderate to even record flooding in a few rivers across northwest Iowa.  Cities like Cherokee, Le Mars, Rock Valley, and Spencer have been hit the hardest by flooding, but high waters are impacted numerous cities across the region. 

Storm Total Rainfall - September 18-21, 2018
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Radar Overview Severe Weather Reports Rainfall Climatology - Sioux Falls
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