Haven't seen it posted in this forum yet, so I question your weenie allegiance. Lol But giving you the benefit of the doubt, you do know that the GGEM has a 6z and 18z run, don't you? If you don't, the only place I've seen it offered is meteocentre.com.
Today's 18z run is very good and similar to today's 12z. Unfortunately, meteocentre doesn't have pretty snowfall maps. It only tells you how much qpf in millimeters falls as snow (for inches, multiply mm x .4.) The closest view for PA they offer is the Quebec map. Anyway, I've attached the precip snowfall thru the end of the run, 84 hrs like the Rgem. Also, the surface map at 84 showing snow still falling in central and eastern parts of PA. Finally, a link for yourself to the Ggem. They have more models, but we can get those from other sources with more info.
https://meteocentre.com/numerical-weather-prediction/forecast-systems.php?lang=en&map=qc&run=18&mod=cmc_gdps&mode=latest&yyyy=latest&mm=latest&dd=latest