The MJO is what had me concerned when we were discussing modeling may be pushing back west gradually with the big warmth . If it does go six with a GOA Low it could possibly force a deep western Trough . May start seeing bowling balls down the west Coast and then move inland. If that's the case, you may be right about the NAO and it may hook with the Continent Ridge but, the good thing too is that's more rare than the NAO, SER Hookup. If the NAO is Central based, Greenland centered, it's doubtful any mid continent hookup. It may just force that Ridge west and cause it to sharpen between the far western Trough and back building Eastern one. That happened a couple of times in the late 80's and early 90's. .
Rather Tricky setup to forecast coming up. Timing of these features is going to affect the Outcome considerably, imo.