The relatively mild temperatures of early Sunday will give way to bitter cold and up to 3 inches of snow by day’s end in Baltimore and 4 or 5 inches north of the city, according to the National Weather Service.

“The expectation is there won’t be much accumulation early because the snow flurries will mix with rain, but then it will be all snow once it becomes the predominant precipitation,” said Kevin Whitt, a meteorologist with the service.

Whitt said the snow accumulation is expected to continue until early evening and then turn to flurries, adding to what remained on the ground from the severe weather last week.

Then, he said, be prepared for it to be really, really cold — a forecast that has already led to closures of Baltimore, Howard and Anne Arundel county libraries and other facilities Sunday and cancellation of the Martin Luther King Jr. Day parade Monday in Baltimore.

Officials throughout the region again are preparing for icy roads, though traffic should be light as most governments and schools are closed for the MLK holiday. The inauguration of Donald Trump in Washington also has been moved indoors, to the U.S. Capitol.

Baltimore Police have advised people to drive carefully due to icy and snowy roads Sunday night, and to keep phones charged in case of an emergency.

The rest of the East Coast was also bracing for several inches of snow Sunday followed by dangerously cold temperatures, according to the National Weather Service.

Winter storm warnings were in effect in the mid-Atlantic through Monday morning and for New England through Sunday. Parts of Massachusetts, New Hampshire and Connecticut could get up to 10 inches of snow.

Philadelphia and New York could also get several inches of snow.

As many as 70 million people will be under some kind of winter storm warning in the coming days, and officials from Washington, D.C., to the north are warning drivers to be mindful of hazardous road conditions.

Points west will also endure some of the coldest temperatures this winter, with sub-zero wind chills from the Rockies to the Northern Plains expected. It will also be unusually cold in the South, from Texas to northern Florida and the Carolinas.

In the Baltimore region this week, don’t expect the snow or leftover ice to melt, said Whitt. The temperature will drop overnight to a low of 21 degrees in Baltimore and the mid-teens up to the state line with Pennsylvania.

The temperature is only expected to reach a high of 25 degrees Monday before dropping to about 10 degrees at night. The wind gusts will make it feel even colder, about 8 degrees in Baltimore and sub-zero north of the city.

The winds will diminish through the week, but it will still feel cold and there is another slight chance of snow Tuesday night, Whitt said, adding that vulnerable pipes could freeze. Let them drip a bit, he advised.

Baltimore Gas & Electric Co. reported no significant problems late Sunday morning, but officials will be keeping tabs on leaks and power outages.

Ann Mooney, a BGE spokeswoman, said the company can track outages with their smart meters installed in homes in the last decade. But she asked those who lose power to report it to ensure an accurate accounting. Call 1-877-778-7798.

“We have no issues so far, but we’re standing by,” she said. “We’re staffed up.”

Meanwhile, Baltimore’s Department of Public Works said in a message to residents that it is still dealing with the effects from last week’s severe weather but is coordinating with the Department of Transportation on the coming snow and cold.

Transportation workers, aided by emergency contractors, began salting roads Saturday and continue to clear ice from alleys to restore trash and recycling collection.

Officials said they also continue to respond to water main breaks caused by the freezing and thawing of pipes. Report breaks and missed waste pick-ups to 311. Baltimore County residents can call 443-263-2220.

The Associated Press contributed to this report.