Observation Date
11/19/2017
Observer Name
Greg Gagne
Region
Salt Lake » Little Cottonwood Canyon
Location Name or Route
Upper LCC (Grizzly Gulch & Catherine's Pass)
Weather
Sky
Few
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Light northwesterly winds but no snow transport noted.
Snow Characteristics
Snow Surface Conditions
Dense Loose
Faceted Loose
Wind Crust
Melt-Freeze Crust
Damp
Snow Characteristics Comments

With a cold, clear sky on Saturday night, the snow surface has begun to facet. Southeast through west was damp this afternoon, and will likely be crusted by Monday.

[Comment - Although there is only a marginal snow cover, we actually have a very interesting thin snowpack right now. This is a great time to get educated on various weaknesses in a snowpack such as facets, facet/crusts combos, graupel, and depth hoar..... it's not as if you're missing out on great skiing.]

Red Flags
Red Flags
Recent Avalanches
Poor Snowpack Structure
Red Flags Comments
Although I have been hearing several people reporting collapsing, despite my best efforts, I have gotten zero collapses in my weekend travels.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments

As Drew noted so well, there is quite a bit going on in our thin snowpack:

​- at the base of the storm snow is a layer of graupel that falls out of the sidewalls of a pit. It is still easy to get shears at this layer;

- this graupel layer is either on top of a crust or sitting on top of a layer of facets from the Nov 4th storm;

- underneath this is a very variable layering of disintegrating crusts and facets, with chained depth hoar down near the ground.

The two things that concerned me today were:

- found evidence of what appears to be a second remotely triggered slide in Catherine's Area. This was on a steep north aspect at 10,100' and likely occurred during the day on Saturday. (With no reports, we are unsure.) This failed 60 cms (2') down on a layer of facets just above a September heat crust.

- I was also able to get full propagation with extended columns on similar slopes, failing down at this faceted layer near the ground. These were ECTP21/22 Q1.

I think triggering slides on these northerly aspects is becoming increasingly unlikely, but if someone were to trigger a slide - even a small one - it would likely be up to 60 cms (2') deep and will involve lots of buried rocks and tree stumps.

Comments

Excuse the poor photo, but view of pit with full propagation with extended column tests down near the ground.

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