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

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

Post-Thanksgiving travel will be treacherous in parts of the Great Lakes region on Monday with more lake-effect snow falling after the region was already buried under feet of it, while cold temperatures remain across a large swath of the United States.