More than 6 inches of snow could fall in New York City and surrounding areas from Sunday into next Monday, part of a massive storm with nationwide impacts, according to weather forecasters.

The snow could begin falling Saturday night, then continue piling up through Sunday and into early Monday morning, National Weather Service meteorologists said.

There is now an 80-90 percent chance of at least 6 inches of snow across the five boroughs, Long Island, North Jersey and the Hudson Valley, forecasters warned Wednesday afternoon.

“It’s still too early for any specifics on amounts…and with the potential start time of the event still four days away, there’s still plenty of time for trends to be continued or disrupted,” NWS meteorologists said.

The city could receive up to 10 inches of snow, according to some models, with even more falling in certain areas.

“The bottom line here is that an impactful winter storm is possible Sunday into Monday,” NWS forecasters wrote. “The storm track, timing and snow amount details will begin coming into focus over the next few days.”

The snow will accompany a brutally cold weekend, with temperatures expected to remain below 20 degrees from Friday night into Monday morning and wind chills staying between 0 degrees and 10 degrees.

On Saturday night, the chance of snow is about 60%, and it will rise to 80% throughout Sunday before dropping back to 60% on Monday morning, according to the National Weather Service.

South Jersey could see up to a foot of snow, forecasters warned. There is a 70-80 percent chance that portions of South Jersey and eastern Pennsylvania receive at least 12 inches of snow, the NWS said Wednesday.

It will be the second straight weekend with snowfall in New York City and surrounding areas. Up to 3 inches of snow fell in the five boroughs last weekend, while about an inch or two more fell in northern New Jersey and Connecticut.

This weekend’s storm is part of a widespread arctic air mass driven by a high pressure system from the north. By Friday, about 230 million people could be dealing with temperatures below 20 degrees, and about 150 million are expected to receive some snow.

“I think people are underestimating just how bad it’s going to be,” said former National Oceanic and Atmospheric Administration chief scientist Ryan Maue. “The whole [Northern] Hemisphere has gone into the deep freeze.”

With News Wire Services