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A man wears a face mask and heavy clothes while walking through downtown Springfield, Ill., in blowing and falling snow as a strong winter storm moves through the Midwest Sunday, Jan. 5, 2014. Temperatures not seen in years are likely to set records in the coming days across the Midwest, Northeast and South, creating dangerous travel conditions and prompting church and school closures. (AP Photo/Seth Perlman)
A man wears a face mask and heavy clothes while walking through downtown Springfield, Ill., in blowing and falling snow as a strong winter storm moves through the Midwest Sunday, Jan. 5, 2014. Temperatures not seen in years are likely to set records in the coming days across the Midwest, Northeast and South, creating dangerous travel conditions and prompting church and school closures. (AP Photo/Seth Perlman)

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    Half of U.S. could drop below 0 degrees

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Half of U.S. could drop below 0 degrees

The nation is experiencing some of the coldest temperatures in decades.

Half of U.S. could drop below 0 degrees

The nation is experiencing some of the coldest temperatures in decades.