2 / 17
University of Wisconsin-Madison student Marisa Weich contends with sub-zero wind chill temperatures while making her way to class on the campus Tuesday, Jan. 22, 2013. (AP Photo/Wisconsin State Journal, John Hart)

Deep freeze grips U.S.

January 13, 2012

A cold snap has sent as waves of Arctic air swept

south from Canada, pushing temperatures to dangerous lows and leaving parts of the Midwest and Northeast reeling.