Photos: Blast of Arctic air

A pedestrian bundled up against the cold walks through the streets of Manhattan on Friday, January 24, in New York City. Polar air settled in over the northeastern U.S. Wednesday, with temperatures in the teens and 20s. Forecasters warned that "bitterly cold conditions" were expected across much of the Northeast, Mid-Atlantic and Mideast through this weekend.

A pedestrian bundled up against the cold walks through the streets of Manhattan on Friday, January 24, in New York City. Polar air settled in over the northeastern U.S. Wednesday, with temperatures in the teens and 20s. Forecasters warned that "bitterly cold conditions" were expected across much of the Northeast, Mid-Atlantic and Mideast through this weekend.