Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as residents along the East Coast contend with a thick blanket of snow — and more snowfall in the forecast.

Snow was falling in the Mid-Atlantic and New York City on Sunday. The coldest air in several years will descend across much of the country starting Monday, forecasters said.

Snowfall forecasts have increased for a winter storm expected to blanket New Jersey with widespread areas of 4 to 8 inches of snow. Winter storm warning areas were expanded early Sunday and a state of emergency is in effect. National Weather Service and AccuWeather

The snow is likely to fall on Sunday from the Appalachians to New England. New York City may see its largest snowfall in years.

Storm Demi is forecast to bring snow to some of the nation’s largest cities, including Washington D.C., New York, and Boston, on Sunday. The winter storm will also usher in cold temperatures in its wake.