As millions of Americans hunker down for the winter storm, 19 states and Washington, D.C., have declared states of emergency.

Forecasters say a clipper system will sweep through the Philadelphia area overnight Friday and could produce periods of snow squalls, including whiteout conditions and intense bursts of snow and wind.

The cold front will dissipate on Sunday as the upper-atmospheric ridge of high pressure slides east of Texas. This will result in a southerly air flow across the region. More atmo

Blizzardlike conditions stemming from a "bomb cyclone" brought heavy snow to the Southeast and ushered in frigid temperatures to much of the East Coast.