A Commuter bundles up against extreme cold conditions Tuesday, Jan. 22, 2013, in Chicago. Temperatures in the area were hovering around zero with sub-zero wind chill reading hitting 10 below. Forecasters say waves of frigid Arctic air began moving over the region Saturday night Jan. 19, 2013. Temperatures are expected to rebound Wednesday Jan. 23, 2013. (AP Photo/M. Spencer Green)

Associated Press
A Commuter bundles up against extreme cold conditions Tuesday, Jan. 22, 2013, in Chicago. Temperatures in the area were hovering around zero with sub-zero wind chill reading hitting 10 below. Forecasters say waves of frigid Arctic air began moving over the region Saturday night Jan. 19, 2013. Temperatures are expected to rebound Wednesday Jan. 23, 2013. (AP Photo/M. Spencer Green)
A Commuter bundles up against extreme cold conditions Tuesday, Jan. 22, 2013, in Chicago. Temperatures in the area were hovering around zero with sub-zero wind chill reading hitting 10 below. Forecasters say waves of frigid Arctic air began moving over the region Saturday night Jan. 19, 2013. Temperatures are expected to rebound Wednesday Jan. 23, 2013. (AP Photo/M. Spencer Green)
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