The UMass Boston campus will be closed Monday amid a massive winter storm, the university announced Sunday night.

Monday was supposed to mark the first day of classes for the Spring semester. According to the university’s campus closure policy, remote and virtual classes “will be cancelled the same as courses and work being conducted face-to-face on campus.” Only essential staff who are required for emergency preparation efforts will report to work.

Greater Boston is expected to see up to 21 inches of snow accumulation from Sunday to Tuesday morning, according to National Weather Service forecasts. Most of the snow is expected to fall before 8 p.m. Monday.

A winter storm warning from the NWS is in effect throughout New England until 8 p.m. Monday. “Travel will be difficult due to low visibility and snow covered roads,” the NWS stated. The agency advises to “consider delaying all travel during the storm. If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency.”

Mayor Michelle Wu declared a snow emergency beginning at 8 a.m. Sunday, banning parking on major roads. “Once the snow emergency goes into effect, vehicles parked on major roads and main arteries will be towed,” the city wrote in a statement. City hall, municipal services and Boston Public Schools will also be closed on Monday.

Weather warnings are also in effect along much of the East Coast and in parts of the Midwest, with ice and extreme cold warnings covering parts of the South. The Associated Press reports that more than a million homes are without power due to ice buildup.

Correction: A previous version of this article provided an inaccurate end time for the city’s snow emergency declaration. The city has not stated when the parking ban will end.