DALLAS (AP) — More than 8,000 flights across the U.S. set to take off over the weekend have been canceled as a major storm expected to wreak havoc across much of the country bears down, threatening to knock out power for days and snarl major roadways.

Roughly 140 million people were under a winter storm warning from New Mexico to New England. The ɫtv Weather Service forecast warns of widespread heavy snow and a band of catastrophic ice stretching from east Texas to North Carolina.

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