Looked to me the NAO tries to link up with the SER which isn't crazy in this progression given the PAC. Remember, the PAC is running the show here essentially and if the ridge in the central PAC backs and pumps enough, then the SER naturally has a response to flex. Couple that with the retrograding NAO that attempts to link up and the pattern is teetering precariously on caving in on itself. Not saying this is right, but is certainly a viable solution given the progression in the PAC. You have been spot on discussion of the progression in the NAO, but we should be taking notes in recent times on how the PAC is dictating the conus pattern Moreso in recent years and what may have been gold just a few years ago has changed quite a bit. Again, not saying this is correct, but just something to consider.