A powerful system of storms churned across the Rocky Mountains and into the Midwest on Wednesday, dumping snow, driving high winds and leaving tens of millions of people in its projected path.

Blizzard conditions were expected in parts of Colorado, Kansas and Nebraska, the National Weather Service said.

Denver was covered in 5 inches of snow Wednesday afternoon, and authorities said high winds caused crashes and road closures in western Colorado, The Associated Press reported. Airlines canceled 50 flights at Denver’s airport, according to NBC affiliate KUSA.

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