Dangerous arctic chill sweeps over US Midwest

Tens of millions of people in the United States are bracing for a potentially life-threatening deep arctic chill forecast to hit swaths of the country on Wednesday. The US Postal Service -- known for its commitment to bringing the mail whatever the weather -- has even reportedly suspended deliveries in Iowa due to the severe cold. Temperatures in almost a dozen states stretching more than 1,200 miles (1,930 kilometers) from the Dakotas to Ohio were forecast to be the coldest in a generation, if not on record.

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