Wind occasionally gusted to M but there was little snow being transported.
Dec 5, 2022
|D2||SS-Soft Slab||O-Old Snow||3ft||
Dec 2, 2022
(+/- 1 day)
|D2||SS-Soft Slab||O-Old Snow||3ft||N-Natural||Report|
Visibility was poor - I wouldn't have been able to see avalanche activity on the drive or across the highway on the north side of Copper.
Slab was thicker and meatier than what is being observed on Galena Summit and south. Starting at 6700', the slab was ~60cm thick and 4F at the base. This increased to an 85cm thick slab that is 1F at the base at upper elevations. Overall HS ranged from 100-150cm.
The 11/27 weak layer presented as: ~30cm of F FC at lower elevations (thick layer of basal FC), a 3cm thick MFcr atop 20-30cm of F FC on mid elevation solars, to a fairly thin layer of F FC atop 40cm of 4F rounding/moist FC (October snow) at upper elevations. We received collapsing on all aspects we traveled on, but the structure and collapsing was most widespread on shady slopes.
A two person simul-stomp on a low-angle ridge triggered a D2 avalanche on the steep slope below. This was a fairly small slope, but the avalanche broke nearly 3' deep the full width of the slope - see avavalanche occurrence report.
A snowpit @8800', E, above a few day old slide looked very similar to the crown profile of the triggered slide. I had ECTX x2 which was surprising, but the pit location likely collapsed at the same time as the avalanche below the site.
Layer Depth/Date: 60-85
Weak Layer(s): Nov 27, 2022 (FC)
Comments: Triggered avalanche, widespread collapsing
We avoided avalanche terrian