Winter storm brings heavy snow and ice and may cause power outages

A monster storm heading across the U.S. is expected to be the biggest of the season thus far. Part of the country could see 14 to 20 hours of continuous snowfall, the National Weather Service warned. 

Areas across the Dakotas, Minnesota and Iowa are expected to get as much as 10 inches before it's over. On Friday, snow fell at a rate of an inch an hour in southwestern Minnesota, creating whiteout conditions, according to CBS Minnesota. Roads in areas around the Twin Cities were covered in slush and snow during the evening commute. 

As much as a half of foot of snow is expected in parts of Illinois before Saturday morning.