WASHINGTON — The federal government was shuttered Monday while the Mid-Atlantic region dug out from as much as three feet of snow that left tens of thousands without power and blocked trains, planes and cars, with another storm looming.

The storm is expected to blow into the Northeast Tuesday evening, bringing 4 to 8 inches to the Central Susquehanna Valley from Tuesday evening through Wednesday, according to the latest local forecast from Accuweather in State College.

Federal agencies that employ 230,000 in Washington were closed, as were many local governments, businesses and school districts across the region. Around 200,000 students in Philadelphia's public and Roman Catholic schools got a snow day.

With more snow expected Tuesday, stranded travelers and those struggling with no electricity wondered when they'd escape the icy, gray mess.

"You've got a whole city held captive here," Gwen Dawkins, who was trying to get to Detroit, said as she waited at Washington's Reagan National Airport, where all flights had been canceled after 18 inches of snow was recorded by Sunday. That was the fourth-highest storm total for Washington. Reagan remained closed for snow and ice removal Monday and officials said operations were expected to resume at some point during the day.

Baltimore-Washington International Thurgood Marshall Airport opened one runway Sunday evening, but airport officials warned that delays and cancellations will likely continue Monday.

Dulles International Airport was open, but the Metropolitan Washington Airports Authority warned that some flights may be canceled or delayed.

More than 24,000 utility customers in Virginia were without electricity after some areas got nearly 3 feet of snow. In Pennsylvania, Allegheny Power reported outages to about 65,000 customers. West Virginia had about 5,000 customers without electricity.