Here’s a snippet from the latest winter wx discussion from WPC
One area that is slowly becoming the most favorable location forheavy snowfall rates and potentially the most impressive snowfallamounts is the central Appalachians, northern VA, MD, and southernPA through early Sunday. As the upper level trough deepens over thecentral U.S. Saturday night, mid- level flow begins to increaseout ahead of it and meets the mid-level warm front stretching fromthe eastern Ohio Valley into the Mid- Atlantic. Several 00z modelshighlight increasing 700mb fgen over the eastern Ohio Valley andinto central VA by late D3, which supports the potential for anextended period of 1"/hr rates across much of eastern WV,central/northern VA, MD, and southern PA. The 0C warm nose maybegin to approach northern VA by the end of D3, but areas just tothe north could see 6-12" by sunrise on Sunday as precipitationlingering further into the day on Sunday. Snow ratios will also befavorable at onset and could potentially exceed 20:1 withinenhanced banding, which is well above the 11:1 climatology in theregion. Current WPC probabilities through D3 are medium to high(40-70%) for at least 8" of snow, this includes areas just west ofI-95 from D.C. to Baltimore. Heavy snow is expected to continuestretching into the Northeast and New England on Sunday, see WPC'sExtended Forecast Discussion for more. Also, see the Key Messageslinked at the bottom of this discussion.