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Ice cold blasts of air spill southward out of the Arctic from the northern Rockies and Plains all the way to the Appalachians and into much of the South.
The nasty cold may be preceded by a blizzard from Montana to Colorado during the Friday through Sunday period before Thanksgiving.
The magnitude of the cold could be so severe from the northern Rockies to the Upper Midwest that actual temperature readings may plunge below zero.
Heavy lake-effect snow from New York to Michigan.