Bitter cold grips millions as US digs out of sweeping snowstorm

A frigid, potentially life-threatening Arctic air mass threatened to delay clean-up as municipalities from New Mexico to Maine tried to dig out following the storm, which dropped a vicious cocktail of heavy snow and wind along with freezing rain and sleet. Over 780,000 customers remained without electricity, the Poweroutage.com tracking site showed. Tennessee, Texas, Mississippi and Louisiana -- southern states unaccustomed to intense winter weather and the bone-chilling cold that's forecast to...