The snow band moved into the Dakotas, then expected to head toward the Ohio Valley Tuesday and toward the East Coast Wednesday and Thursday where it could produce coastal flooding, Accuweather.com reported.
The snow already has dumped snow in the northern Rockies after bringing rain to San Francisco and Salt Lake City. Steady snow was reported from eastern Montana through northern Iowa, with some accumulation in Bismarck and Fargo, N.D., and Watertown, S.D.
Snow was expected to disrupt the morning rush hour in Chicago and last most of the day Tuesday, with accumulations of 6-10 inches expected. So far this winter, the biggest snowfall in Chicago has been 5.4 inches and the seasonal accumulation pales to past years.
Heavy snow was expected in parts of North Carolina, West Virginia, Pennsylvania and New Jersey by Thursday, with a foot or more forecast for higher elevations.
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