Hannah and Astrid Grimskog play in Times Square during a snow storm on Monday in New York. (AP Photo/Seth Wenig)

NEW YORK (AP) — A massive snowstorm pummeled the northeastern 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.

Meteorologists said the storm is the strongest in a decade, dumping more than 2 feet of snow in parts of the metropolitan Northeast, shattering accumulation records in places, immobilizing transit and even leading the United Nations to postpone a Security Council meeting. Officials declared emergencies, schools closed, including in New York City, which had its first “old-school” snow day in six years, and people grappled with power failures.

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.

While it was paralyzing and potentially dangerous for millions along the Eastern Seaboard, meteorologists found themselves rhapsodizing over the combination of power and beauty.

The storm hit the “Goldilocks situation” of just the right temperature for wet, heavy snow: Any warmer and its precipitation wouldn’t have fallen as snow, any colder and there wouldn’t have been as much moisture in the air to feed that snowfall, said Owen Shieh, warning coordination meteorologist at the National Weather Service’s Weather Prediction Center in Maryland.

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.

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

More than 5,600 flights in and out of the United States were canceled Monday, and a further 2,000 flights scheduled for Tuesday were grounded, according to the flight tracking website FlightAware. Most of the cancelations involved airports in New York, New Jersey and Boston. Almost 2,500 flights were delayed.