Us? Location dependent. Not sure what a cooperative Pac means tbh(you didn't say that but you responded to a post that did). A 'flood' of PAC air associated with the NPJ will often produce prolific snows in the high terrain of the western US. Also, the Pac jet characteristics(extensions, contractions) are variable, and will induce shifts in the strength/location of associated h5 features that ultimately impact the sensible weather further downstream. This is never a constant, so even in an overall hostile pattern for winter weather, periods of actual legit winter weather can still occur. We have seen this happen multiple times in recent winters with -PDO/Nina conditions.