WASHINGTON, Jan. 26 -- More than 670,000 customers in the US as far west as Texas were without power and more than 10,000 flights were expected to be canceled on Sunday ahead of a monster winter storm that threatened to paralyze eastern states with heavy snowfall. Forecasters said snow, sleet, freezing rain and dangerously frigid temperatures would sweep the eastern two-thirds of the nation on Sunday and into the week.P10...