A storm riding a blast of cold air will unleash heavy snow on the central and southern Appalachians Saturday and will turn toward part of New England by Sunday.
Heavy wet snow and falling trees could block some roads in parts of the Appalachians.
Even in the absence of heavy snow for the major cities, including along the I-95 corridor, gusty winds can lead to travel problems for a time. Flight delays are possible in Washington, D.C., Philadelphia, New York City and Boston.
After bringing some of the first snowflakes of the season to areas from Detroit to Cleveland and Pittsburgh on Halloween evening, the storm will dive southward on Saturday.
Accumulating snow is in store for the mountains from southwestern Pennsylvania to northern Georgia.
The heaviest snow will fall in the area from western Maryland and West Virginia to western North Carolina and eastern Tennessee.
According to AccuWeather Chief Meteorologist Elliot Abrams, "The highest elevations of West Virginia could pick up a foot of snow."
While the snow will melt or turn very slushy on major roads in the region, enough can fall to make some roads slippery.
Power outages are also possible in parts of the central and southern Appalachians as the weight of snow may bring down trees limbs and power lines. The risk will be highest for power outages as gusty winds accompany a push of cold air during and after the storm.
"For some areas in the central Appalachians forecast to be hit with heavy snow with the storm this weekend, the last major early season storm to bring heavy snow was from Sandy in 2012," Abrams said.
There have been multiple snow events around Halloween over recent years in the Northeastern states, including the Nor'easter of 2011, Sandy in 2012 and the elevation snowstorm of 2008.
Farther to the north and east, it will be too warm for snow of significance with this storm in the mid-Atlantic along the I-95, from Richmond, Virginia, to Washington, D.C., Philadelphia, New York City and Hartford, Connecticut.
A wedge of dry air will also likely greatly limit snow showers from northern Pennsylvania to upstate New York and much of New England Saturday into Sunday.
The storm moving off the mid-Atlantic coast will then strengthen significantly over the warm waters of the Atlantic Ocean. The exact track of that storm will determine whether or not heavy snow occurs in areas other than eastern Maine and the Maritime Provinces of Canada. If the storm swings too far to the east, no snow will fall over much of this area, except for over eastern Maine and neighboring Canada.
People who live in or travel to eastern Long Island, Rhode Island, eastern Connecticut, eastern Massachusetts and New Hampshire should closely monitor the storm's progress and check for updates on AccuWeather.com.
Regardless of the amount of snow this weekend, cold, gusty winds will pick up Saturday and continue through Sunday in the Northeast. Winds will diminish by Sunday in much of the South.
Gusts in excess of 40 mph are possible over the mountains, in open areas, between buildings and on some of the bridges. The strongest winds will affect eastern New England, where the storm will strengthen. Gusts in some coastal areas of New England may reach 60 mph.
This weekend, many areas in the South and Northeast will have their coldest weather since last April.
AccuWeather RealFeel ® Temperatures will dip into the teens over much of the Appalachians and into the 20s along much of Piedmont areas of the South and along the from the mid-Atlantic to New England in the wake of the storm.
Runners partaking in the New York Marathon on Sunday will have strong, gusty winds in their face for part of the route and low RealFeel Temperatures.