US winter storm: Heavy snowfall envelops cities, over 2000 flights cancelled
1 / 12Information signs are seen at O'Hare International Airport in Chicago on Thursday. Frigid air is moving through the central United States to ...
1 / 12Information signs are seen at O'Hare International Airport in Chicago on Thursday. Frigid air is moving through the central United States to the east, with windchill advisories affecting about 135 million people over the coming days, weather service meteorologist Ashton Robinson Cook said on Thursday. (Image: AP)2 / 12Snow begins to fall in the city of Hazleton, Pennsylvania, as an unidentified person uses an umbrella for protection on Thursday. (Image: AP)3 / 12A dog walker named Courtney walks with her dogs near Lake of the Isles on Thursday in Minneapolis.