Appreciate the insight and knowledge.
Night Shift 6z GFS in 48 minutes. I won't be here have to get up at 6 am for an oil change(Ugh!) and then gone all day.
Not luck. Let me try to simply this:
Niña/+QBO = better for PNW than Niña/-QBO (same usually true of neutral ENSO except in a few particular setups).
Niño/+QBO = worse for the PNW than Niño/-QBO
All of the years you reference were neutral or Niña/+QBO except for 2018/19 which was saved by a major SSWE that perturbed the tropical forcing (and barely a niño). Had that not happened it would have gone the route of 2002/03.