The storm caused at least two traffic-related deaths Saturday night , including one north of Madison, Wis., where a car hit a truck, Accuweather reported Sunday.

The storm dumped up to a foot of snow in some parts of the Midwest, snarling road travel and delaying flights at the region's airports, including O'Hare in Chicago where more than 400 flights were canceled.

Police said road travel would remain hazardous through Monday as temperatures fluctuated and the storm system created more lake-effect snow.