No relief for snowed-under WashingtonFebruary 9, 2010 2:18 p.m. EST
Another 10 to 20 inches of snow forecast for northern Virginia, eastern Maryland
Federal workers, students in Washington told to stay home Tuesday
Washington National Guard personnel will help with emergency response
A record 32.4 inches of snow fell on Dulles International Airport over weekend
Washington (CNN) -- Another massive snowstorm barreled toward the mid-Atlantic region Tuesday with forecasters telling residents still reeling from a paralyzing weekend blizzard to be prepared for more of the same.
Hundreds of flights were canceled, and airlines were waiting to see whether they'd have to cancel more.
The National Weather Service predicted another 10 to 20 inches of snow for northern Virginia and eastern Maryland, including the District of Columbia, beginning Tuesday afternoon and continuing through Wednesday.
Federal workers and schoolchildren in the nation's capital were told to stay home for a second day. The new storm If as severe as predicted would be the third major snowfall to hit the nation's capital and surrounding region in just over seven weeks.
It won't begin snowing in some areas until Tuesday night or Wednesday.
Forecasters said Philadelphia, Pennsylvania, could be slammed with 3-7 inches Tuesday and an additional 8-12 inches on Wednesday. Washington could get 5-9 inches Tuesday and another 5-9 inches Wednesday. In Boston, Massachusetts, 2-4 inches of snow are expected Tuesday. New York can expect 1-2 inches Tuesday and 6-10 inches Wednesday.
Airlines at O'Hare and Midway international airports in Chicago, Illinois, preemptively canceled flights and are reporting delays, said Gregg Cunningham, spokesman for the Chicago Department of Aviation.
In last weekend's blizzard, a record 32.4 inches of snow fell on Washington's Dulles International Airport over two days, breaking a January 7-8, 1996, record of 23.2 inches.
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All Washington National Guard full-time personnel were asked to report for duty Tuesday morning and told to expect to stay two or three nights, helping with emergency response operations.
Snow coverage from CNN affiliate WBAL
Crews worked to clear roads and repair power lines, and utilities warned it might take days to restore electricity to some customers from Pennsylvania to Virginia.
Amtrak will offer limited service between New York and Washington on Tuesday.
And bus services in Maryland and Washington said some routes might be canceled, depending on the severity of the storm.
Reagan National, Dulles and the Baltimore airports were all operating early Tuesday, but each asked passengers to check with their airlines before coming.
Are you there? Share your winter weather photos, video
Federal workers in Washington and students in most schools in the nation's capital got a snow day.
Claire Jacobi of Arlington took the subway to shoot a video of children sledding on the Capitol grounds.
"It was just a magical moment. It was a big family gathering," she told CNN's iReport.
In Michele Kontaxes' subdivision in Ashburn, Virginia, the snow finally stopped falling after 30 hours.
"I took my Nikon D60 out for a long hike around the neighborhood, where I encountered snow thigh high and a few neighbors who were cross-country skiing in the neighborhood," she said Monday. "I also encountered several snow-covered cars, where nothing but the antenna was visible."
