Frigid Air Sends Temperatures Plummeting Across Much Of U.S.

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Unusually cold air is pushing across much of the U.S. today, accompanied by winds that make it feel even colder.
Wind chill warnings stretch from Montana to Alabama. In a big chunk of the Midwest, the wind and subzero temperatures moved in behind a foot or more of snow, making travel treacherous.
In the Dakotas, where wind chills dropped to the minus-50s, drivers are being urged to carry winter survival kits in case they get stranded.
Airlines have canceled more than 1,600 flights today at Chicago's O'Hare airport, where the temperature hit a record low for the date of 16 below zero. The Chicago Transit Authority is handing out fare cards for the homeless so they can ride buses and trains to escape the cold.
School systems shut down from the Dakotas to Maryland. Indiana's Legislature postponed the opening day of its 2014 session.
The cold is being felt as far south as northern Georgia, where temperatures plunged into the 20s early today and highs in the single digits are expected tomorrow.