Great forecast discussion by CTP for the snow chance tomorrow night.
Lift ahead of the sfc low will generate precip out of the lowering deck, but initially dry llvls will resist it. By sunset, some snow is expected to hit the ground along the MD border, generally in the Laurels, but perhaps over closer to THV/LNS, too. The synoptic situation lends itself to some slantwise instability over the CWA, with banded precip likely. The intensity and placement of the band(s) is in question. These mesoscale features usually are at this range. While the details are not clear, the big picture is that most if not all of the precip over the CWA will be snow.
The SLRs are expected to be rather low/wet (7-10:1). That`s a negative for big SF numbers, as is the forward speed (and lowresidence time) of the system. It`s much like a clipper, but coming more from the west than from Alberta (Kansas Klipper).
However, most models make 0.10" of QPF over the srn half or so of the CWA, mainly between 00Z and 10Z Sun. A stripe of heavier (0.25") QPF is possible per the NAM and a couple of HREF members, but "Where?" is the question. At this point, the mean answer is somewhere between UNV and MDT, parallel and close to a JST-AOO-SEG-HZL line. The main takeaway at this time in the forecast was to raise the SF numbers to 1-2" in that area, and make mention of T-1" all the way south to the MD border. Will keep mentions of T-1" in a stripe of zones from Clearfield to Sullivan Cos. This should cover subsequent waggle(s) N and S of the focus for slightly heavier precip. All said, someone on the higher elevations in the Laurels and/or Ridge-and-Valley Region may get near 3". At this range and with the uncertainties of multiple items, there is no need for an advy anywhere - yet.