Heavy lake-effect snow hit the region over Thanksgiving weekend, with up to 20 inches of snow still to come early this week.

Parts of New York, Michigan, Ohio and Pennsylvania have been walloped by a major winter storm that dropped feet of lake-effect snow over the weekend. CBS News national weather correspondent Rob Marciano has more on the show and CBS News senior transportation correspondent Kris Van Cleave has a look at how it's complicating post-Thanksgiving travel plans.

Lake effect snow is slamming the Great Lakes, with seven states from Wisconsin to New York under snow alerts on Monday.