Cold snap to grip half the country on Thanksgiving — and it might not end there

As Thanksgiving approaches, a blast of cold air is set to sweep across the eastern U.S. leaving millions shivering.
Tuesday: Temperatures will plunge quickly in the Rockies and High Plains as the cold front dives south.
Wednesday: The colder air will then sweep through the Midwest, the lower Mississippi Valley and into the heart of Texas.
Thanksgiving Day: By Thursday, this cold weather will extend across nearly the entire eastern U.S., from New York to the southern Appalachians. It will also still be in plac