Observation: West Bowl

Observation Date
11/23/2013
Observer Name
Greg Gagne
Region
Salt Lake » Big Cottonwood Canyon » Silver Fork » West Bowl
Location Name or Route
West Bowl of Silver Fork
Weather
Sky
Scattered
Wind Direction
East
Wind Speed
Moderate
Weather Comments
-3 C @ trailhead at 0900. We could hear the winds up above, but the Honeycomb and Davenport Hill ridgelines protected much of the terrain in Silver Fork through mid elevations. Gusty easterly winds atop West Bowl of Silver Fork at 10,100'
Snow Characteristics
Snow Surface Conditions
Faceted Loose
Wind Crust
Snow Characteristics Comments

Outside of wind affected terrain, was finding very fine-grained near surface facets where sheltered from the winds. Snow depths range from about 45 cms (1.5') at 9000' to 60 cms (2') between 9000 - 10000'. Even deeper where there has been wind loading.

Red Flags
Red Flags
Wind Loading
Poor Snowpack Structure
Red Flags Comments
Although winds were primarily easterly, there was enough cross-loading and channeling that you can find wind deposits on many aspects. My partner got one collapse on a wind drift on an East aspect. I could not find a faceted layer underneath, so presumed it was the DF's sitting underneath the wind slab.
Comments

Quick walk up Silver Fork from Solitude to the top of West Bowl of Silver Fork. I have only toured in LCC this season, so was curious what the snowpack looked like on the other side of the ridges. No detailed pits - lots of quick hand pits and pole probes to get an overall sense of what the snowpack looked like. Overall was finding less snow in Silver Fork than at similar elevations in LCC. Additionally, I was finding the 30cms of depth hoar in upper elevations of LCC to be quite loose and dry. The depth hoar layer where I was traveling today was shallower (10-15 cms/4-6") with damp grains.

Was finding widespread soft and hard wind slabs primarily on leeward aspects from the recent East winds, but ascending East-facing West Bowl of Silver Fork, was also finding cross-loading on subridges. My partner and I were able to get several of the wind slabs to crack out 1-3 m (3-10'). These were all failing on a layer of decomposing fragments (DFs) from the Wednesday/Thursday storm snow. Slabs were mostly 15-30 cms and varied from 1F to P hardness. However, many of the recent wind slabs were not sensitive, and I suspect they will continue to become less sensitive.

Big picture remains at avoiding steep, upper elevation northerly aspects with recent wind loading.

Overall was surprised at the decent travel and skiing conditions. Our snowpack is not (yet) a facet wallow, and travel conditions are quite good on firm snow. Was buzzed by a pair of eagles while ascending West Bowl. Pretty nice.

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate