Millions along the East Coast are set to get wholloped by a massive blizzard that could drop as much as 24 inches of snow in some parts of the region stretching from New York City up to Boston and beyond, forecasters said.

More than 1,700 flights were canceled Saturday in anticipation of the treacherous conditions at major travel hubs like JFK, LaGuardia, Newark, and Boston Logan to ensure operational safety, according to FOX Weather. 

“We are describing this storm as a major nor’easter,” AccuWeather senior meteorologist Carl Erickson told The Post early Saturday of the storm, which is expected to impact more than 30 million Americans from as far south as  Delaware and Maryland to New York and Boston.

The storm is predicted to begin Sunday and rage into Monday morning with wind gusts of more than 60 mph and with snow expected to fall between 1 and 3 inches per hour in some areas, causing experts to warn of potential power outages and coastal flooding.

New York Gov. Kathy Hochul declared a state of emergency for New York City, Long Island and Southern Westchester County beginning Sunday morning — ahead of the major nor’easter that will bring a predicted 18 to 24 inches of snow to the Big Apple alone. 

Extreme Impact Zones — when substantial disruptions to daily life are expected — have been expanded to include New York City and Boston, Fox Weather reported. 

The storm will have “very strong winds, near blizzard conditions, and treacherous travel conditions,” said Erickson, who added, “And those travel conditions are going to worsen rapidly Sunday night into Monday morning.”

The blizzard warning for NYC, Long Island and New Jersey takes effect at 6 a.m. Sunday and lasts until 6 p.m. Monday.

Blizzard warnings are only issued when 13 to 18 inches of snow is expected and winds of 55 mph are predicted.

The five boroughs and Long Island are expected to get anywhere from 18 to 24 inches.

“There could be some localized power outages with the wind gusts,” Erickson warned.

Light snow will start as early as 6:00 a.m. Sunday morning, when temperatures are above the freezing mark, but precipitation will get heavier by the afternoon.

“It will be difficult to get a lot in the way of accumulation during the daytime hours on Sunday, just given temperatures above freezing,” he said.

“The worst of this storm will be overnight Sunday and into Monday morning. That’s when we expect the core of this nor’easter.”

Snowfall rates will start getting higher around 5 p.m. Sunday, he said.

The heaviest snowfall will be from 10 p.m. Sunday through 10 a.m. Monday.

“You could be talking about 1 inch per hour or higher during that time,” he said.

Snow remains heavy until mid Monday morning, but will lessen around noon, and will finally end by late afternoon.

“The heaviest of snow will begin to taper off as we had past daybreak Monday,” he said.

“But there will still be some snow flying around into Monday afternoon.”

Temperatures will be in the mid 30s tomorrow, with Monday a little warmer, in the upper 30s.

“There’s not going to be a an extreme shot of cold air with this storm, which is why it will be difficult to get the snow to accumulate during the day tomorrow,” he said.

On Tuesday, temperatures will be in the mid 30s, and on Wednesday and Thursday, back into the lower 40s.

“So it will a slow, gradual melt of the snow throughout much of next week,” he said.

The last official NYC blizzard, dubbed “Snowzilla,” was January 2016, when the city was hit with over two feet of snow.