I was at PCMR on Sunday, and there was a big slide on West Face (Jupiter Peak area) that was released by avalanche control that morning. It was deep - 4 or 5 feet - and fairly wide. It ran from the ridge down to the lake by the base of the lift.
They opened the area to skiers early that afternoon, and I skied in that area. The chunks left over from the slide were very solid, as the snow was heavy and compacted from the wicked winds of the previous 3 days (gusts to 80+). Skiing across the debris field was really dodgy, as the slabs were rather large and solid. Many tall pines were wiped out by the slide, so the cleanup come spring will be quite involved.
The non-affected snow was heavy due to a high snow line (it was raining at the base of PCMR that day, with the snow line around 7,500'), but quite skiable, with good "kick" at the end of the turn.
I'm not surprised that there was slide activity there, though. Here's a rendering of where the slide was (a quick Photoshop of the official PCMR trail map):