blizzard warnings were expected to expire early Thursday. Some areas in New York, Maryland and Washington

Blizzard warnings in some areas, such as Philadelphia, Pennsylvania, expired late Wednesday. And other blizzard warnings were expected to expire early Thursday. Some areas in New York, Maryland and Washington, already buried under layers of snow, might still see light snow Thursday, the National Weather Service said.

Officials were still deciding early Thursday whether to open Dulles International Airport and Reagan Washington National airports, after they were shut down Wednesday.Amtrak was still providing limited service for Washington, New York and Boston, Massachusetts, on Thursday, but most passenger rail service south of Washington was canceled.

The New York subway system was expected to run normally Thursday, compared with the limited service at the height of the blizzard, transit officials said.This winter is already the snowiest on record for Washington and its suburbs, as well as Baltimore, Maryland, and Wilmington, Delaware, the National Weather Service said. And it’s on track to set records in other cities, including Philadelphia and Atlantic City, New Jersey.

The 55 inches of snow that have accumulated in the nation’s capital during the past two storms proved too much for some buildings. Snow was blamed for the collapse of at least 22 roofs in Washington.In central Pennsylvania, Interstate 80 near Clearfield was shutdown after two pileups — one involving 17 cars and the other involving seven cars, said Rich Kirkpatrick of the state’s Department of Transportation.One person died and another person was seriously injured, police said.

Winter storm plods through West, (MidwestDust Storm Accidents)

Winter storm plods through West/ Dust Storm Accidents

DENVER  A fast-moving winter storm is promising to bring a white Christmas to parts of the West and Midwest, but not without threatening to cause long delays and tough driving conditions for countless holiday travelers.The storm is expected to dump more than a foot of snow on parts of Colorado and Southern Utah by midday Wednesday, and blow east into the Plains states through Christmas Day. Blizzard warnings were likely on Christmas Eve in Kansas.”Pretty much the entire central and southern Rockies are going to get snow, and then it’s going east and will drop more snow,” Stan Rose, a National Weather Service meteorologist in Pueblo, Colo.With the snowstorm looming, holiday travelers scrambled Tuesday to adjust their plans.

In Denver, Sarah McAnarney and her husband planned to leave town Wednesday to visit family in Ozark, Mo., with their springer spaniel, Olive. But forecasts prompted them to skip a day of skiing in the Rockies and start driving a day early.

McAnarney said she was caught in a blizzard two weeks ago in the Rockies and needed four hours to drive 100 miles from Vail to Denver. She said she didn’t want to repeat the experience.”I was driving through a whiteout,” she said Tuesday at a truck stop east of Topeka, Kan. “You couldn’t see over your headlights.”

On Tuesday, blustery weather was already snarling traffic in Arizona, with blizzard-like conditions shutting down roads and causing a pileup involving 20 vehicles. South of Phoenix, a dust storm set off a series of collisions that killed at least three people.A tropical jet stream pumping in moisture from the storm’s south was likely to cause plenty of snow as the storm heads into the Plains states.South Dakota Gov. Mike Rounds declared a state of emergency Tuesday, giving his state more flexibility to prepare.

A winter storm watch was in effect for most of southeast Colorado, the panhandle of Oklahoma and north Texas through Thursday. By Tuesday afternoon, light snow was falling in Salt Lake City. No major airport delays were reported there or in Denver, but holiday travelers across the region were warned to check with their airlines before arriving for flights.In western Nebraska, a Colorado woman was killed Tuesday on Interstate 80 when her SUV apparently hit black ice and slid across a median.

In Nevada, multiple wrecks were reported in and around Reno as snow blanketed the area shortly before the Tuesday evening commute. No serious injuries were reported, the Reno Gazette-Journal newspaper reported.

Meanwhile, many holiday travelers in the region decided to adjust their plans. Craig Rueschhoff and his girlfriend, Brenna Larson, planned to leave Des Moines, Iowa, on Tuesday evening instead of Wednesday night to make the 210-mile drive to Columbus, Neb., to visit his parents.Rueschhoff, 35, said they also planned to visit Larson’s parents in western Iowa on their way back to Des Moines but thought about skipping the annual trip.

“We’ve had both my mom and her mom encourage us not to come if the weather is too bad,” he said. “They wouldn’t feel bad if we didn’t come. We’ve gotten their blessing.”

The winter conditions follow a weekend storm that dropped record snowfall and interrupted holiday shopping and travel on the East Coast. Delays from that storm sparked an unruly crowd that included passengers still on standby Tuesday at the Delta Air Lines terminal at John F. Kennedy Airport in New York. Police were called to help with crowd control.

Rose said holiday revelers in the West and Midwest should worry about the cold as well as the snow. Temperatures across Colorado on Christmas were not expected to get out of the 20s, with single-digits expected in the mountains.“It’s going to be cold to begin with, and then it’s going to get even colder,” Rose said.