About 5 million people were under weather alerts on Monday following a treacherous post-Thanksgiving travel weekend, as snow is forecast to continue to wallop parts of the Great Lakes region, while a good portion of the continental United States is experiencing bitter cold temperatures.

Post-Thanksgiving travel will be treacherous in parts of the Great Lakes region on Sunday due to several feet of lake-effect snow, while biting cold temperatures sweep across a large swath of the United States.

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