Observation: West Desolation Ridge

Observation Date
12/12/2022
Observer Name
Staples / Talty / Meisenheimer
Region
Salt Lake » Big Cottonwood Canyon » Mill D North » West Desolation Ridge
Location Name or Route
Bear Trap to West Deso Ridge
Weather
Sky
Overcast
Precipitation
Moderate Snowfall
Wind Direction
Southwest
Wind Speed
Light
Weather Comments
Bands of snow were in and out for much of the day. However, we were very happy with the extra 3-6" it provided throughout our tour. Wind was mainly from the southwest, but we had an occasional gust from a different direction.
Snow Characteristics
New Snow Depth
15"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments
It's about as good as I can remember for December 12th in Utah. The lower-angled terrain rode like a dream and it's truly a winter wonder land. Powder everywhere.
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Wind Loading
Cracking
Collapsing
Poor Snowpack Structure
Red Flags Comments
It's time to back off the steep terrain and ride the lower angles slopes (less than 30°). We triggered two avalanches during our tour, and the one on the north side of the compass would have ruined your season. It's way too dangerous to ride steep terrain on the north side of the compass.
Comments
Mark explains why due south might not be as touchy as other aspects. The big takeaway is that we do have faceted snow on due south. A stout crust above the weak layer allows it to be more stubborn to triggers.
Video
Same pit location as above. We are showing an extended column test with no propagation on due south at about 9300'.
Video
We decided to dig another snowpit on a southeast-facing slope at about 9500' in elevation. Here we were able to see propagation within our snowpit tests. We had two layers fail with full propagation. The uppermost layer failed on small-grained faceted snow, and the bottom layer (more concerning) failed underneath a thin melt-freeze crust on more well-defined faceted snow. In either case, if you are getting full propagation with your extended column test, you can trigger an avalanche. I am still a little concerned with the steep southeast-facing terrain.
Video
Today's Observed Danger Rating
High
Tomorrows Estimated Danger Rating
Considerable
Coordinates