NEW YORK (AP) — A massive snowstorm pummeled the northeast United States from Maryland to Maine on Monday, forcing millions of people to stay home amid strong wind and blizzard warnings, transportation shutdowns, and school and business closures.

The storm dumped up to 2 feet (60 centimeters) of snow in parts of the metropolitan northeast as accumulations from an earlier snowfall had just melted away — except for gray mountainous piles in parking lots and along the side of roads. Officials declared emergencies from Delaware to Massachusetts, and hundreds of thousands of people grappled with power failure from downed electrical lines.

Even as the snow moved northward and tapered off in other areas, the National Weather Service said it is tracking another storm that could bring more snow to the region later this week.

The weather service referred to Monday's storm as a “classic bomb cyclone/nor’easter off the Northeast coast.” A bomb cyclone happens when a storm's pressure falls by a certain amount within a 24-hour period, occurring mainly in the fall and winter when frigid Arctic air can reach the south and clash with warmer temperatures.

New York City and Boston canceled public school classes for Monday, while Philadelphia switched to online learning. New York Mayor Zohran Mamdani called it the “first old-school snow day since 2019.” But class would be back in person on Tuesday, he said.

“You can still pelt me with snowballs when you see me,” he told kids after saying schools would reopen.

For Monday, though, he had another mission for students: "Stay cozy.”

People begin digging out even as snowfall continues

In Lower Manhattan, snow shovelers appeared to outnumber commuting office workers, and pedestrians walked freely in streets normally blocked by morning traffic.

“It’s very quiet, except for the howling winds,” said Luis Valez, a concierge at a residential tower just off Wall Street, as he cleared the sidewalk. “A couple of residents have gone out to get their essentials. Other than that, there’s nothing.”

Matthew Wojtkowiak, 57, an attorney, was also shoveling in his Brooklyn neighborhood.

“I’m from the Midwest, so this is in the zone,” he said. “Not too bad, not too easy, either.”

Schools were closed, and he said he hoped people would get out and enjoy the snow.

“We have sleds at the ready,” he said.

Karen Smith and Adele Bawden are tourists visiting New York from the United Kingdom.

“We’ve been dancing in Times Square this morning in the middle of the road in rush hour,” Bawden said. "We’ve just been dancing and not believing we could do it.”

Ingrid Devita said she liked to patrol the Lower East Side on skis, checking on people who might need help.

“I find people fall in the snow and they can’t get up,” she said.

In Mystic, Connecticut, where at least 2 feet (60 centimeters) of snow has fallen so far, crews at the Mystic Seaport Museum prepared to clear snow from a fleet of historic ships, including the 113-foot-long Charles W. Morgan, a wooden whaling ship from the 19th century American merchant fleet.

Shannon McKenzie, vice president of watercraft operations and preservation, said shipyard staff will clear the snow by hand using rubber or plastic shovels because machinery or metal shovels could damage the boats.

Storm fuels power outages

New York, Philadelphia and other cities, as well as several states, declared emergencies.

More than 5,000 flights in and out of the United States were canceled for Monday, according to the flight tracking website FlightAware. Most were canceled in New York, New Jersey and Boston. Rhode Island’s T.F. Green International Airport announced Monday that it was temporarily ending all airport operations.

Public transit ground to a halt in some areas, while DoorDash suspended deliveries in New York City overnight.

Storm-related power outages plunged more than 500,000 customers into darkness along the East Coast early Monday, including over 212,000 customers in Massachusetts and 128,000 customers in New Jersey, according to PowerOutage.us, which tracks outages nationwide.

About 10,000 customers were without power Monday morning on suburban Long Island. New York Gov. Kathy Hochul said utility crews would restore power as soon as possible, but winds of 50 mph (kph 80) or higher could delay action.

Snow causes travel woes and closures

Commuters in and around New York felt the strain.

In New York City, several subway lines reported severe delays, while the Long Island Rail Road was fully suspended until further notice. Some Metro-North commuter trains between New York City and its suburbs were delayed by up to an hour. New Jersey Transit suspended bus and rail services “until further notice.”

The weather service said strong wind gusts could cause whiteout conditions and warned of a “Potentially Historic/Destructive Storm” southeast of the Boston-Providence corridor.

“Winds like that, combined with heavy, wet snow, are a recipe for damaged trees and prolonged power outages,” said Bryce Williams, a meteorologist with the weather service’s Boston office. “That’s what we’re most concerned with, is the combination of those extreme snow amounts with that wind.”

Outreach workers meanwhile tried to coax homeless New Yorkers into shelters and warming centers.

Various landmarks and cultural institutions were closed Monday, including New York’s Museum of Modern Art and the Arlington National Cemetery in Washington, D.C. Broadway shows were canceled Sunday evening.

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Izaguirre reported from Albany, New York, and Rush reported from Portland, Oregon. Associated Press writers Mike Catalini in Morrisville, Pennsylvania; Mark Kennedy in New York; Darlene Superville in Washington; Susan Haigh in Hartford, Connecticut; and Christopher Weber in Los Angeles contributed.