Travellers wait in line to inquire about the latest on Amtrak service suspension March 2, 2018 at Union Station in Washington, DC.
Up the coast in Scituate, Massachusetts, Becky Smith assessed the damage wrought in the coastal town near Boston, where on Friday powerful ocean waves dumped mounds of sand and rubble on roads and winds uprooted entire trees.
More than half the flights scheduled to arrive and depart from New York's LaGuardia airport were cancelled, with sweeping disruptions at Boston Logan International and New York's two other area airports, Newark and John F. Kennedy International.
MA is taking the brunt of the storm, which hit Friday and was not expected to ease up until midday Saturday, according to weather authorities. "Our house is lifted so, like, nothing came into our first floor, but our whole basement is probably six feet underwater".
Almost 17 million people were still under a coastal flooding warning early Saturday afternoon.
And the winds in eastern MA will be ferocious.
Private forecasting service AccuWeather said the storm dumped as much as 18 inches (46 cm) of snow on parts of NY state and Pennsylvania.
The storm grounded 5,489 flights, both domestic and worldwide, and scores more were delayed, according to FlightAware.com.
Passenger railroad Amtrak halted service between Boston and Washington through Friday, and said it was suspending southbound service out of the USA capital until at least Saturday morning because of downed trees on the track.
At least five people have died, according to authorities: a 77-year-old woman in Kingsville, Maryland; an 11-year-old boy in Putnam County, New York; a 44-year-old man in James City County, Virginia; a juvenile in Chesterfield County, Virginia; and a Newport, Rhode Island, man who was in his 70s.
A 25-year-old man in CT, a 57-year-old Pennsylvania man and a 37-year-old MA man were killed when trees fell on their vehicles Friday. The boy was rushed to hospital, but his mother told the station his organs were failing.
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Floodwaters in Quincy, Massachusetts, submerged cars, and police rescued people trapped in their vehicles.
"When it really came up, we just stayed in, hoping", Alp told The Boston Globe.
"Take this storm seriously!" the National Weather Service in Boston warned via Twitter Friday.
Police in Quincy, Massachusetts, were using heavy front-end loaders to rescue people from flooded homes.
In other pockets, the storm dropped large amounts of precipitation, including heavy snowfall, or its winds pushed in seawater during high tides, inundating bayside neighborhoods.
"Concerns for coastal flooding will continue into Saturday with potential for high tide flooding", said NBC meteorologist Sherri Pugh.
In Boston, many streets were closed and city officials advised people not to drive or walk in high water.
Meanwhile, Massachusetts Gov. Charlie Baker declared a state of emergency Saturday, joining governors in Maryland and Virginia who had earlier made the declarations.
"As the saying goes, March is coming in like a lion, and we are preparing for heavy snow, rain, and flooding across NY this weekend", he said. "Once you saw the National Guard, that's when I was like, 'OK, we should have evacuated'".
The rain is expected to begin Thursday night, with low temperatures dropping into the upper 30s.
Peyton Gwinn, a hostess at the seafood restaurant Tortugas Lie in Nags Head, said, "We've been busy for the past couple of days. nothing's stopped us or our customers, yet". "Much worse than the snowstorm we had".
So-called bomb-cyclone conditions are not uncommon for nor'easters, but this one could be even more intense than the storm earlier this year and cause record flooding and intense damage.