MILWAUKEE (Reuters) – A record-shattering Arctic freeze kept its grip on much of the United States east of the Rocky Mountains on Tuesday but temperatures everywhere except the Northeast were expected to warm within 24 hours.

Many school districts shut their classrooms due to the cold snap, which claimed four lives over the long New Year’s weekend.

The National Weather Service issued wind chill warnings for Tuesday as dangerously low temperatures were due from eastern Montana across the Midwest into the Atlantic coast and the Northeast and down through the

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