This is a snowpit in Grand Prize Canyon, north of Mushroom Ridge, at 9600'. The aspect is ENE and the slope angle is 33 degrees. The weak layer is a thin crust with facets on top of it about 16 inches deep. This layer failed very cleanly (Q1) on the 3rd tap of an Extended Column Test. Upon stepping out of the pit, I caused a collapse with several cracks that propagated out 50 feet from my skis. This instability seems to be very specific to North Valley, upper elevation aspects ranging SE through E through NE, but it is definitely capable of producing a dangerous avalanche.
Quality video, unstable snow for sure. It has always made sense to me to be on belay (with a rope and harness, anchored to a tree) when you are on a suspect slope like this. Otherwise, it is dangerous to get on the slope that you suspect may be unstable, which is presumably where one is doing snow stability tests. "Upon stepping out of the pit, I caused a collapse with several cracks that propagated out 50 feet from my skis." Yikes!
Once you are on belay, then you can jump on the slope ;-).
wasatchbill 3 years ago
spooky.
Nataraja13 3 years ago