Observation: Grizzly Gulch

Observation Date
12/14/2019
Observer Name
Justin Lozier (AAI)
Region
Salt Lake » Little Cottonwood Canyon » Grizzly Gulch
Location Name or Route
Grizzly Gulch
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Wind Loading
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments
The persistent slab problem remains #1 on our list of avalanche problems due to its high potential for creating deep, connected slab avalanches up to size 3. We did not observe this layer in our snow profiles today, as we were practicing avoidance of suspect aspects and terrain features that may harbor this layer. The danger rating for this problem is on an increasing trend as the snowpack continues to take more load with new snow and wind loading.
Avalanche Problem #2
Problem
Wind Drifted Snow
Trend
Increasing Danger
Problem #2 Comments
We observed light to moderate winds predominantly out of the west all day, increasing in the afternoon. Wind loading was observed throughout the day, although we avoided lee slopes and remained below ridgeline all day. Fresh wind slab development was observed on exposed terrain features that were taking a cross-load, mostly W-NW aspects within the area in which we were traveling. Few ski cuts were performed on small test slopes where these fresh wind slabs had formed and only minor cracking was observed, 1-3 meters in width - no active ski cuts.
Snow Profile
Aspect
West
Elevation
9,600'
Comments
The morning started off a bit on the warm side (-5C at 9 am) until the passage of a cold front and an associated graupel storm in the late morning through the afternoon bringing colder temps (-11C at 4 pm) and increased wind speeds. The vast majority of the new snow today fell in the form of graupel which was blown around all afternoon. We stuck with a conservative travel plan and thus did not get into any steep terrain and stayed below ridgeline, out of the wind. We specifically avoided N-NE-E aspects today, due to the forecasted High danger rating on those aspects.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
High
Coordinates