I agree that the first time period to watch is the 25-30th. The look is fairly progressive heading into December with the high latitude blocking suppressing everything, but the split flow pattern looks really good. At this time I think our biggest worry heading into December would be a SE or Mid-Atlantic snow storm rather than a storm that cuts. You can see the models the past recent runs have begun to step away from the cutter solutions because, well, basic physics! You can't cut a storm into a strong block as advertised. Verbatim, the last week of November and December as you mentioned could feature an Archambault event with a classic looking -NAO to a neutral/positive NAO. Good times ahead.