While descending the south facing slope of Bob's Knob, above the Aspen Grove Parking lot, our party came across a recently triggered avalanche. The crown was about 3 feet at the high point, and it propagated about 300 yards down the ridgeline, and ran all the way into Aspen Grove—really a very large slide with devastating consequences if one were to get caught. As we gawked at the crown, our 4th and final party member kicked off a smaller pocket from above which was much smaller, but still caused us to ski quickly out of the way, across the bed surface of the original slide. This pocket behaved a little oddly, in that it broke far above us, and a few seconds after the skier had come to a stop. From what we could tell, a skier (not in our party) triggered the slide on a hard turn. It broke on weak facets on the rime layer that formed during the recent rain event in the area. The sun had been hitting the slope for much of the morning, (although the snow was still creamy and soft on the surface) and I think heated thing up just enough to make the buried crust a slip and slide. The slide broke below and away from the original tracks. Perhaps that skier will also chime in with details. We exited the rest of the way into the lower slopes of Primrose Cirque via the ridgetop above the avalanche path. We got a pretty good look at it. This is not a path you'd want to be caught in, as it funnels into a large, narrow, steep, gully. The debris pile was huge. It was a textbook slide. It broke on a rollover, slid on a slippery crust, on a wind loaded slope. The report this morning stated that "there has been an interesting amount of activity on SE, S, and SW facing slopes the past few days." This slide is another manifestation of that behavior.
