Observation Date: 12/02/2017
East Aspect Mcalla Peak Bitterroots.
Overcast. Light Winds. Light snow precipitation. Temp High approx 29*
Light winds between 5-10 mph. Occasional gusts ~15 mph
Lots of snow previous snow transport observed, however not much taking place at this time.
New Snow: 0-3″
No previous avalanches observed.
At approximately 13300 Dec 2, 2017 I dug a pole pit at 8600′ on the East facing shoulder of Mcalla Peak. Slope angle 32*. I observed a quality 1 sheer on an ice crust. The wind slab above was approximately 41 cm deep and well bonded. This area was not shaded and was away from trees.
It appears this ice crust layer is on multiple aspects. There was lots of transported snow observed on all aspects. I attempted to get this slab to slide on South and East aspects by cutting test slopes at more shallow trigger areas, but was unable to get it to move. I observed no cracking or whoomfing.
Observer: David Hanks