I feel much closer to the PNW than the Rocky Mountains for some reason, probably because the mountains were practically outside my front door in Utah. But, I am not sure if Idaho is truly part of the PNW. Seems like the news calls it the Central NW, or something like that, when describing the area.
@woofie, is that what you've heard it called? Seems like the Spokane news refers to it as that, when reporting the weather. That would include the Eastern line of WA that is against the Western line of Idaho. To me, the PWN is more than anything, the area on the West side of the Cascade mountains. I've lived over there, and it is a totally different climate than it is on the East side of the mountains. However, I do think that most people think PNW when they think of all of Washington and Oregon, especially those people who haven't been to those two states. Not sure that Idaho is really considered in that designation. Maybe Northern ID, but surely not Southern ID.
I'm a relative newbie here, having only been here a year, so I may be totally wrong about all of this.