Loading from new snow and wind is overloading an exceptionally weak snowpack. Slope >35* with any wind effect/stiffening seemed likely to slide. Wind-sheltered slopes had less of a cohesive slab, but would likely slide on slopes approaching 40 degrees.
HST was fairly low density and did not seem particularly inverted. The wind was affecting open, mid-elevation terrain leading to a slightly stiffened surface. Significant amounts of snow was being drifted along exposed ridgelines, with drifts in excess fo 60cm observed. S1-2 throughout our tour from 1200 to 1600.
Dec 1, 2022
Above Hwy 75 between Titus Lake TH and top of Galena Summit
|D1.5||SS-Soft Slab||O-Old Snow||1.5ft||U-Unknown||Report|
Road cuts above highway 75, especially below and above the highway uphill from Camp Cr hairpin
|D1||SS||O-Old Snow||40-50cm (est)||Unknown if plow triggered or natural||None|
No visibility of upper elevation terrain.
New snow on wind-sheltered slopes was generally low-density and right-side up (except for weak facets below).
@8700', E: HS 100cm. HST 55cm. Base of HST was F+. 11/27 presented as thin/deteriorated/soft crust with some perc channels below it atop 40cm of F FC going to 4F at the ground. ECTN10 and ECTP11 on 11/27.
@8800, NW: HS 105cm. HST 55cm. 11/27 interface to ground was completely faceted, ranging from F at 11/27 interface to ~4F at ground. ECTP11.
We only observed cracking in wind-affected terrain, where it was widespread.
Layer Depth/Date: 55cm
Weak Layer(s): Nov 27, 2022 (FC)
Comments: Rose indicates terrain where we directly observed the problem.
We avoided avalanche terrain