Blizzard in Pennington Plains, South Dakota

A mix of wintry precipitation changed to all snow. Across the plains of western South Dakota, two to six inches of snow fell with Harding and Perkins counties being the hardest hit. Up to nine inches fell in the central and northern Black Hills. Strong northwest winds, frequently to 40 mph, caused near zero visibility in blowing and drifting snow. Most roads, along and north of Interstate 90 and in the northern Black Hills, were closed or blocked by drifted snow. Numerous auto accidents and isolated power outages were reported.