Bitterly cold temperatures continue to grip the Great Plains and Upper Midwest. People are seen here walking along the frozen lakefront on Wednesday in Chicago. Scott Olson/Getty Images hide caption
north pole north pole
Bitterly cold temperatures continue to grip the Great Plains and Upper Midwest. People are seen here walking along the frozen lakefront on Wednesday in Chicago. Scott Olson/Getty Images hide caption
Commuters wait for a train as snow falls in Chicago. With a polar vortex hitting the Midwest, wind chills could dip to 55 degrees below zero in northern Illinois. Kiichiro Sato/AP hide caption