Thanksgiving arctic blast for Midwest, Eastern US

Cold temperatures will start to make their way into the Lower 48 by Wednesday across the Northern Plains and Upper Midwest where temperatures are expected to drop 5-10 degrees below average. The cold air will start to push further south and east by Thanksgiving. Highs across the Great Lakes will be in the 30s. Temperatures will continue to fall well below average. By Friday, more than 200 million Americans will be below their average temperature.