The slp was better then 12z by 2mb, Hence the tic north and better qpf for southern areas, It was a tic warmer aloft as well, Not sure what some look at when they comment.
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.