A man shovels snow outside a church in Lowville, New York, on Friday. Cara Anna/AP

Emerging from their holiday food comas and shuffling toward the nation’s airports and highways, some Americans may discover the biggest holiday indigestion has nothing to do with pie. A potent storm is muscling into the journey home, threatening to upend the post-turkey travel plans.

A storm moving through the Rockies on Friday will morph into a full-blown, cross-country storm with the potential to dump heavy rain and several inches of snow across more than 1,000 miles of the country this weekend.

The storm is also also opening the door for a new, colder rush of frigid Arctic air that will send temperatures plummeting for millions right before the calendar flips to December.

Pre-holiday weather alrea

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