A potent snowstorm has charged across parts of the South, making roads treacherous and delaying flights in Georgia and closing churches across Alabama.
The storm is heading north, where major cities on the Eastern seaboard are expecting to get socked.
Up to 7 inches of snow is expected through tomorrow morning in areas of Maryland, northern Virginia and Washington, D.C., where the mayor has declared a snow emergency.
In New York City, Mayor Michael Bloomberg says it's clear the lions of March "are getting ready to roar." He says more than 1,300 sanitation workers would spread salt and plow city streets to prepare for the snowfall.
The storm threatens to drop up to a foot of snow in the Philadelphia area, 13 inches in New York and 15 inches across southern New England.
People are being urged to take note of driving conditions and to allow for flight disruptions.