About 400 flights at Delta Air Lines canceled . Expected high in Southeast , Memphis , minus 11 , wind chill as low as minus 35 . At least 7 deaths attributed to deep freeze , which is reaching record lows in some areas . In North Dakota , Memphis , city officials turn on heat for those who ca n't pay utility bills .
About 400 flights at Chicago O'Hare International Airport canceled . Expected high in Bismarck , North Dakota , minus 11 , wind chill as low as minus 35 . At least 7 deaths attributed to deep freeze , which is reaching record lows in some areas . In Memphis , Tennessee , city officials turn on heat for those who ca n't pay utility bills .