Cold air will rush eastward from the Ohio Valley to all of the Northeast on Christmas. Bands of windblown snow will affect areas downwind from the Lakes into the northern and central Appalachians.
Rainbow Over New Jersey by "elizabethbran" on Dec. 17, 2014. Upload to http://photo.accuweather.com to qualify!
Rain with areas of fog should spread from Virginia to New Jersey Monday or Monday night then spread into New England for Tuesday. From the mountains of northeastern Pennsylvania into the interior of New England this could at least start as snow or ice. The GFS for 1 AM New Year's Day looks interesting. See the map below. Whether or not this storm develops and where it will snow or rain cannot be precisely predicted two weeks in advance using these models.
Update on the long-range forecast model data.
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A look a the storm systems that could impact Christmas Eve and Christmas Day in Canada.
Sun Sinks Below the Horizon in Frenchville, Pennsylvania, by "cloudspin" on Nov. 11, 2014. Upload to http://photo.accuweather.com to qualify!