Yeah, I can see getting 20" over the whole month, Chances of hanging on to snow pack increases as you get further along in Dec too if you can avoid the grinch, I avg 22" here for the month, But never had those totals in the first 10 days or so.
I think the 18z GFS is going to like the system around the 22nd, More northern stream interaction, Better but still needs work, Plenty of time left though for this to go one way or the other.
I have never seen an RPM run i like so it must skip Maine.
That plant is a tough kill, To get rid of it is not a very conventional method environmentally.