I found the 12/7 surface hoar everywhere I looked on a variety of aspects at middle and edging into upper elevations (9400' was as high as I got). It seemed the most sensitive on shady slopes and in areas with wind-stiffened snow.
Mostly cloudy in early afternoon, with increasing clouds in the late afternoon. A few snow flurries occurred in late afternoon.
North side of Avalanche Peak into Rainbow Creek
|D2||SS||O-Old Snow||40-50cm||N-Natural||Approximately 60-70m wide. The depth was about right for the 12/7 SH. Variation in crown depth indicated at least some wind effect.|
Snow depth ranged from 40-60cm. Got a significant collapse while skiing on a S aspect at 8600. Cracks propagated out about 20m. See pit below - the fracture occurred on the 12/7 SH atop a MF crust that was buried 30cm deep in this location. The slab was F hard and beginning to facet, so the extent of propagation was quite surprising. I got an ECTP5 in this pit. The 12/7 layer was buried closer to 40cm on shady slopes, and where the wind had stiffened the slab, I got a couple of large, rumbling collapses that shook snow off trees 30m away.
I avoided avalanche terrain.