Great post from pro Met. @wdrag in the NYC forum that I think could apply to us in Central PA.
“fwiw... if the ULL tracks east, probably no go for us n of I80 but if the ULL tracks 1 or 2 degs further N, then I think the I84 corridor has a good chance of deformation zone snow (4") in n-nw edge of 7H LOW where FGEN-convergence occurs. I'll be watching trends in the modeled 7H-5H lows the next several days. In the meantime, 12z op model heights at 500MB are generally 30-60M higher than the 12z EC op. That makes a significant difference in ptype nw edge.
Thermal profile are marginal but I'm pretty sure if models reverse the se trend in today's models, that we'll see a pretty decent amount of snow in the Pocs-I84 corridor. This still has a chance to edge a little further north than recently modeled. It's not an overwhelming amount of cooling in the column that is needed, in my opinion. It's latitude of the 7H-5H low that I think is important fgen significant snow N of I80.”