Track / speed more crucial on the 12z suite all looking good - great. RGEM/ICON AIGFS a bit quicker than GFS/NAM. The QPF will be better honed in on later 18z/00z and tomorrow with meso models. At the time Nam/GFS more robust but banding likely under done on the globals in general. There will likely (as occurs in these rapidly developing storms) bands that drop 0.5 or more in 2-3 hours / 3 - 6 inches of snow.