I have always been under the impression Arctic air for the CONUS doesn't come from Alaska as a very strong general rule. Usually Nunavut or Greenland with cross polar flow is the source. Anything is possible but waiting For a PV to drop from Alaska to the CONUS is very rare.
This has been quite a boring fall so far, not only for the intermountain west region, but for much of CA and the SW as well. I'm hoping that changes as we get closer to the Holidays!