DALLAS (AP) — Almost 10,000 flights across the U.S. set to take off over the weekend were canceled as a monster storm started to wreak havoc Saturday across much of the country and threatened to knock out power for days and snarl major roadways with dangerous ice.

Roughly 140 million people, or more than 40% of the U.S. population, 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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