CNN: By Derek Van Dam, Meteorologist — New York City and the surrounding region are expected to see “major to extreme” winter storm impacts through Tuesday due to a powerful nor’easter forecast to bring 12-18 inches of snowfall and wind gusts as high as 45-50 mph.

With heavy snow and strong winds, blizzard conditions are possible on Monday, according to the National Weather Service office in New York. The heaviest impact for the city is expected to be on Monday, when 1-3 inches of snow could fall per hour, but the storm will linger into Tuesday.

New York Mayor Bill de Blasio urged residents to stay home during the storm. In-person school will shift to fully remote on Monday, and Covid-19 vaccination appointments will be rescheduled, he said.

Overall, more than 110 million Americans will feel winter’s sting early this week as the nor’easter takes aim at the most densely populated cities along the East Coast.

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Citing expected snow, high winds and coastal flooding, New York Gov. Andrew Cuomo on Sunday directed state agencies to mobilize emergency response resources.

New Jersey Gov. Phil Murphy declared a state of emergency starting at 7 p.m.

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The Emergency Operations Center has been activated, and troopers are ready to assist as needed. Power outages are expected, and state authorities are in contact with utility companies on their storm preparations, said a news release from Murphy’s office.

State offices, Covid-19 vaccine “mega-sites” and most public transit will be closed Monday, the release said.

It’s been almost two years since Washington, DC, has had a snowfall greater than 1 inch, but that could change drastically by later Sunday. The city is under a winter storm warning through Sunday evening, with 4-8 inches of snow possible. Additional snow will likely fall on Monday.

“Forecasting snowfall amounts in the nation’s capital is rarely easy, but confidence is increasing that the DC area will see a significant snowfall developing on Sunday and lasting into Monday,” says CNN meteorologist Taylor Ward.

The storm could bring the nation’s capital as much as 10 inches of snow. This would end the 709-day streak that Washington, DC, has gone without a snowfall greater than 1 inch.

“The only other time this has happened was a 788-day streak that ended in 2013,” said CNN meteorologist Brandon Miller.

The storm’s path

On Sunday morning, more than 110 million people were under winter weather alerts from the southern Great Lakes to New England. The storm left heavy snow across northern Illinois and central Indiana, causing travel headaches.

The storm will strengthen into a powerful nor’easter by Monday morning as it reaches the coast. This will be a long duration event for many along the eastern seaboard as the system will be slow to exit.

Snow will fall in periodic bursts over the next three days from DC, Philadelphia, New York City to Boston, ending gradually from the southwest to the northeast.

Major impacts expected

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CNN Weather

Strong winds will accompany the heavy snow, reducing visibility and causing power outages. Travel disruptions will be extensive from the ground to the air as the storm coats roads and runways with fresh snow.

Snowfall rates of 1-2 inches per hour were reported near Chicago’s suburbs late Saturday evening, where up to 9 inches of snow is forecast by Sunday night.

As the storm moves east, it will reorganize and intensify. The highest snow accumulations will occur from New Jersey to southern New York, eastern Pennsylvania and parts of Maryland, where up to a foot of snow is possible.

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CNN Weather

Ice and sleet accumulation is also a concern for portions of North Carolina, Virginia, Maryland and West Virginia. The highest totals will likely fall north of Charlotte and Raleigh where up to 1/2 inch of ice is possible.

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CNN Weather

The warm sector of this storm is creating numerous showers and embedded thunderstorms across the central and southeastern US today. Expect a rainy Sunday in Atlanta before showers exit the region by the start of the work week.

Areas farther west such as St. Louis and Springfield, Illinois, will see more of a rain/snow mix through Sunday evening. Exactly how much snow will stick to the ground remains uncertain.

One week after areas of Iowa were pummeled by snow, the Hawkeye State could see a few additional inches by Sunday night.