Observation: Snake Creek

Observation Date
1/6/2021
Observer Name
R. Kosinski
Region
Salt Lake » Big Cottonwood Canyon » Brighton Perimeter » Snake Creek
Location Name or Route
Snake Creek
Red Flags
Red Flags
Recent Avalanches
Wind Loading
Cracking
Collapsing
Rapid Warming
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
As we discuss the PWL, it is important to note that there isn't just the above ground layer that is currently plaguing the snowpack. There are multiple buried layers of facets from the numerous dry spells we have had. From our ECT on this SE facing slope we found the facets at 40cm and 65cm above ground to be most reactive. It also doesn't appear that much healing of these facets is going on.
Avalanche Problem #2
Problem
Wet Snow
Trend
Increasing Danger
Problem #2 Comments
With temps rising and new snow on the ground, the chance of loose wet snow avalanches is increasing. The sun was scorching the south aspects and by the time we left, there were rollerballs coming down especially around the rocks and trees. In some areas, the new snow has fallen on more consolidated old snow or on wind slabs which makes loose wet slides more likely.
Comments
Started our tour to Non-Dairy Creamer in Snake Creek around 1000 this morning under warm, sunny, and clear conditions. Immediately we noticed the widespread natural avalanche cycle that had occurred during the previous day's storm on the E and N aspects in both Snake Creek and Caribou Basin. Got a couple good collapses as well as some cracking in isolated areas. We had a very large collapse down in the trees at the base. Skiing was good with no signs of instability. By the time we left around 1400 the snow was wet and rollerballs were frequent on steep slopes.
In our pit at 9500' SE upper 20° we had some concerning results. ECTN 3 on the new snow/old snow interface 70cm above ground. ECTP 7 on a very slim facet layer 65cm above ground and an ECTP 8 on a facet layer 40cm above ground. On this southern aspect there were no near ground facets but an ice layer with a stout snow layer on top. These are some pretty scary results and if we ever get a good load of snow we will probably see widespread avalanches on these layers all around the compass.
As we progress with this poor snowpack structure and have a lot of "considerable" days, its important to remember that considerable means human triggered avalanches are LIKELY and may contain large avalanches in specific areas. The most avalanche fatalities occur during "considerable" days.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable
Coordinates