From Our friend DT: ABOUT NEW ENGLAND / NE PA/ SE interior NY/ nw NJ.... SUNDAY SNOWSTORM
Currently there is major Trough in the jet stream is moving from the Plains into the Mississippi Valley. This system has developed LOW pressure In ARK and MO. This LOW pressure area will track northeast into OH and the eastern Great Lakes. As it does so most of the rain in the Midwest and the Ohio Valley will bypass the Middle Atlantic region except for a few showers Thursday night into Friday morning.
Friday afternoon will see a lot of sunshine especially in VA MD and DEL as well as western NC. Readings are likely to go above 70° in many areas even as far north as Washington dc/ bal and into the mid and upper 60s into the Shenandoah Valley and near 60 in southwest VA and the mountains of western NC.
BUT A second area of LOW pressure will develop in the Mississippi Delta on Friday night and Saturday morning. This well-organized LOW pressure area will intensify as it moves northeast up the Appalachian Mountains across northern GA, eastern TN and western NC by Saturday night.
This will spread significant rain from GA to MD and across all of eastern TN, eastern KY and WV. The LOW pressure area will drive into OH by Sunday morning but then it will transfer its energy as it jumps over the mountains and a new LOW pressure area will develop off the VA/ MD coast .
As the system moves away, it will pull in colder air and the rain could end as snow in western MD, the eastern panhandle of WV and the northwest 25% of VA for a few hours Sunday night or predawn hours of Monday. More significant snowfalls possible in northeast PA, southern NY and interior portions of southern New England