The National Weather Service said "travel could be difficult to impossible" in places where snowfall is forecast to continue into the beginning of the week.

Snow accumulations between 1 to 3 feet are possible over the higher elevations of the Sierra Nevada, as well as much of the Intermountain West and the Central Rockies on Tuesday.

The Great Lakes region saw new snow Monday and faced the prospect of even more this week after U.S. travelers battled harsh weather to get home after Thanksgiving, forecasters said. Snow showers fell in western Michigan overnight,