A late-winter storm that's dumped snow on the Deep South is now barreling into the Mid-Atlantic region bringing the threat of much heavier snow as it heads north up the Interstate 95 corridor.

The storm has already knocked out power to 5,500 customers in southwestern Virginia. Most of the state is under a storm warning through midday Monday.

There's a snow emergency in the nation's capital, where a messy morning rush is possible.

The National Weather Service says the largest accumulations will be found east of I-95, making this storm a bit unusual. It could be the Mid-Atlantic region's biggest snowstorm in 6 years.

Philadelphia is bracing for up to a foot of snow.

In New York, the snowfall could reach a foot or better; Mayor Michael Bloomberg says the March lions "are getting ready to roar."

Southern New England could get socked by up to 15 inches.