A cross-country storm could dump over a foot of snow on the Big Apple this weekend, meteorologists warned Monday.

And flakes aren’t the only thing this massive system is bringing.

The atmospheric event will likely gift Big Apple residents “a messy mixed bag of snow, sleet and rain,” Accuweather meteorologist Dave Dombek told The Post.

The sheer size of the “Tennessee Valley” storm, how much land it’ll impact and how much water it’s carrying make it one to watch.

“This is a pretty significant, juicy storm,” Dombek said. “It could be a 24-hour storm.”

There’s a 10 percent chance that snow will fall straight from when the storm hits Saturday night all the way into Sunday.

More likely is that we’ll see “all forms of precipitation,” Dombek said, “all snow [or] some snow then ice then rain.”

Between about an inch to over a foot of flakes is possible, Dombek said.

Currently brewing over the Pacific, the system should hit California by Thursday and will then make its way from Texas, through the Tennessee Valley and to the East Coast.

The last storm to hit the Big Apple dropped just 6 inches on the ground Nov. 15. — but practically paralyzed the city.

Mayor Bill de Blasio blamed “bad luck” and lousy forecasting — not poor planning — for the inept response to the wintry weather, which brought chaos and massive traffic to NYC roads.