 Sustained winds of 30 – 50 mph (48 – 80 km/h) with gusts from 70 – 90 mph (113 – 145 km/h) produced snowdrifts up to in some locations.Some roads were closed for up to 11 days.Sioux Falls, South Dakota saw visibilities of below for 24 straight hours, and just east of Sioux Falls a 2,000-foot (610 m) broadcast tower collapsed under the storm's fury.