https://easternmassweather.blogspot.com/2019/11/wet-holiday-travel-week-leads-to-onset.html
The early December storm depends on how quickly that ridging node over Greenland displaces eastward.....faster will result in further north redevelopment, which is pretty much what I favor. However more reluctance for that to cede ground is more of a sne swfe or even late-bloom redeveloper.
I like Maine most for that.
Changeable NAO early month should trend positively as the polar stratosphere warms, and the pacific grows more favorable. We need the Pacific to drive especially mid December onward. Thaw later December or early January as meager warm ENSO forcing fades, and Pacific grows more hostile in advance of any sensible impacts from downward propagating polar stratospheric warmth. (December 15 maturation)? I would give the reemergence of any polar blocking until a good 3-4 weeks after that December 15 date to materialize, thereafter we await blocking.
December is Pacific driven, with any major coastal snows resulting from transient neg NAO node teaming with favorable Pac between 12/5 and 12/15. However I am more confident in major Archambault potential nearer the end of this period, as maturation of any potential SSW could enhance the MJO in phase 8 on or about December 15th. Thereafter, we trend milder.
Pacific deteriorates late December or early January, and then we thaw while hopefully awaiting downward propagation of mid December SSW to take hold mid January.
Second half is blocking dependent with more la nina like Pacific.
Just my two cents-