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A multifaceted winter storm will continue to produce traffic-snarling snow, wind and ice to the northeastern United States through Tuesday night.

The storm began as an icy mix in the mid-Atlantic and snow in the central Appalachians on Monday and Monday night. Parts of southern Pennsylvania and northern Maryland received 3-6 inches of snow before precipitation changed to an icy mix.

Snow and ice will continue to spread northeastward over northern New York state and New England Tuesday night.

"Snowfall of 6-12 inches will be common from northern New York state to southeastern Maine," according to AccuWeather Senior Meteorologist Alex Sosnowski.

"However, from 12-18 inches of snow is forecast over the northern tier of New England," Sosnowski said.

Some of the higher elevations of the Adirondacks, Green and White Mountains may approach the AccuWeather Local StormMax™ of 20 inches with the storm.

Slowly, freezing rain and sleet will gradually change to rain from south to north across central and eastern Pennsylvania, northern New Jersey, southeastern New York state and southern New England.

Travel will be difficult and dangerous due to snow, ice or a slushy combination. Widespread instances of spin-outs and accidents can occur, as well as many airline delays and flight cancellations.

"If anyone has to be out during the storm, it is advisable to heed all travel restrictions and guidelines on area roads," AccuWeather Senior Meteorologist Mike Doll said.

A significant buildup of a glaze of ice, on the order of 0.25 to 0.50 of an inch has occurred from the eastern Panhandle of West Virginia to northern Virginia and central Maryland during Tuesday.

Ice also glazed trees and power lines from southern Michigan to the northern parts of Illinois, Indiana and Ohio into Tuesday morning.

Across much of Pennsylvania and northern New Jersey, sleet, instead of freezing rain has occurred thus far and spared most places from widespread power outages.

However, freezing rain remains a threat for several hours Tuesday evening over the upper mid-Atlantic and later Tuesday night in parts of upstate New York and New England.

"While an AccuWeather Local StormMax™ of 0.60 of an inch of freezing rain can occur, in some areas, the combination of sleet and freezing rain may cause an ice buildup close to an inch or more, on top of the snow that falls in some locations," Sosnowski said.

Moving forward, where this buildup is mostly freezing rain and not sleet, trees and power lines will be weighed down to the point of causing at least sporadic power outages. In some areas however, regional and widespread power outages are likely.

Farther south, rain will fall along Interstate 95 from Washington, D.C. to Philadelphia and on toward the coast. Residents of the Ohio Valley and much of the mid-Atlantic, including western Pennsylvania, Maryland the the Delmarva, can expect rain and melting ice and snow to pond on roads and saturate lawns.

A changeover from snow and ice to rain is expected along the Interstate 95 corridor from New York City to Boston as Tuesday night progresses. Travel delays can arise due to localized flooding, gusty winds and limited visibility.

Meanwhile, farther west across the central Appalachians, a change from rain and ice back to snow is forecast toward morning. Cold, gusty winds and lake-effect snow showers and squalls will riddle the upper Great Lakes and Northeast at midweek.

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