Temperatures expected to drop into single digits in New York City.
Forecasters are now calling for up to 14 inches of snow in Philadelphia and southern New England, and up to a foot of snow in New York City -- followed by bitter cold temperatures.
An arctic air mass will plunge the eastern half of the United States into a deep freeze for days to come. Wind chills are expected to be as low as 40 degrees below zero in some spots.
Schools in Pennsylvania, New Jersey and other states in the region are closed for an extra day after the Martin Luther King holiday, or they're planning to send kids home early.
More than 2,000 flights have been canceled and thousands more are delayed. Some schools are dismissing early and the federal government has closed its offices in the Washington area.