Here's a link to the 18z GGEM. Yes, the GGEM and not the Rgem. The GGEM runs at 6z and 18z too, but as far as I know, only Meteocentre has it; I'm sure you may be able to find it somewhere else, so have at it. The region I chose from the top of the page is Quebec because it's as close in to our area as you can get on this dos based website.
Anyway, the link below is for precip totals that fall as snow during the 84hr forecast period in mm. Basically, the dark blue stripe across central MD is at least 5mm, or .2". So figure 2"-3" at 10:1.
https://meteocentre.com/numerical-weather-prediction/precipitation-accumulation.php?mod=cmc_gdps&run=18&type=SN&lang=en&map=qc&mode=latest&yyyy=latest&mm=latest&dd=latest
Other info for the model are here:
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