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Powerful Winter Storm from the Upper Midwest into the Northeast; Severe Thunderstorms in the Midwest and Ohio Valley

A rapidly-intensifying storm is expected to bring heavy snow, blizzard conditions, and icing from the Upper Midwest through the Great Lakes and Northeast. Scattered severe thunderstorms may produce severe/damaging wind gusts and a couple of tornadoes across parts of the Midwest and lower Ohio Valley through the evening. Arctic air will expand across the central and southern U.S.. Read More >

Overview

Thunderstorms rapidly developed around midnight on June 11th in central South Dakota, producing large hail up to 2.5 inches in size. As the storms moved to the east-northeast, they evolved into a line and produced a large area of wind damage across east central South Dakota.

The hardest hit areas were across Clark, Codington, Hamlin, and Deuel counties, where winds were estimated to reach 80 to 90 mph.  The storms continued east into Minnesota and eventually Wisconsin and Upper Michigan, producing damaging winds into the afternoon hours.  

Storm Reports across SD on June 11, 2017
Storm reports across eastern South Dakota and central Minnesota during the morning of June 11, 2017. 
Radar Loop of the storms developing and moving east through east-central South Dakota. Image
Radar image of storms as they strike the Watertown area at 5:30 am on June 11th, 2017 GOES-16 Infrared Satellite Imagery at 4:50 am. (Preliminary, Non-Operational Data)
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