At least 50 people have died across the U.S. in 'once-in-a-generation storm'

Kala Smith of Buffalo, N.Y., heads for a food store Monday on Main Street, not far from where she lives, after a massive snowstorm blanketed the city. (Craig Ruttle/AP)

A massive winter storm that's killed about 50 people across the U.S. is expected to claim more lives as the frigid weather continues into the week. More than half the deaths occurred in western New York, in what Buffalo's mayor called a "once-in-a-generation storm."

For six days, a blast of polar air from Canada has been wrecking holiday travel plans as it lumbers across the country, leaving power outages, canceled flights and dangerous roads in its wake.