If there is one thing that seems to be going for next weekend it's the evolution of the pattern across the eastern PAC into the western U.S. The signal is there for not only somewhat substantial ridging across the western U.S. but the structure of the ridge doesn't look bad...would favor deep troughing in the east and they key here is where the trough axis becomes positioned. Even looks like some very weak but noticeable ridging (or at least higher heights) poking into the Arctic.
As long as models aren't very off with the development of the ridge to the west we're in a good spot. As far as any worries about the airmass...as long as the track is off-shore the majority of the region should be fine. Looking at 850 temp anomalies can be very misleading given the time of year we're in...sure they may be above-average but we're still talking about -10C's 850's in southeast Canada.