Observation: Uintas

Observation Date
12/30/2020
Observer Name
jg
Region
Uintas
Location Name or Route
Duchesne Ridge
Weather
Sky
Overcast
Wind Direction
Northwest
Wind Speed
Light
Snow Characteristics
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments
Surface and near surface faceting noted on shady slopes out of the wind.
Red Flags
Red Flags
Recent Avalanches
Cracking
Collapsing
Poor Snowpack Structure
Red Flags Comments
Lots of cracking and audible collapsing.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
Early season snow is faceted and very weak and now has slab sitting on top of it.
Snow Profile
Aspect
East
Elevation
9,600'
Slope Angle
24°
Comments
Photos below as follows:
Planar bed surface where ECT failed (ECTP11)
Faceted grains on which pit tests failed.
Surface facets.
Thin snowpack conditions exist in the western Uintas. Upper elevation slopes have enough snow to ski and ride, mid elevation is pretty bony and low elevation slopes have little to no snow. With only 2 feet of snow, the upper elevation terrain still has plenty of hidden obstacles to deal with.
Lots of audible collapsing in my travels today. The bottom foot of the pack consists of unconsolidated faceted grains that fell out of the pit wall as I was digging. Extended column tests failed cleanly with easy/moderate effort and consistently propagated a facture across the column (ECTP11). My tests were failing on 2mm faceted grains just above a decomposing crust, 35 cms (14") down. This persistent weakness is not going away anytime soon and will be something we'll have to deal with for a while. Slopes 30° and steeper on the north half of the compass and east facing slopes should be considered suspect. As more water weight is added to the snowpack this weak layer is going to come alive. I'll be keeping slope angles down and very aware of slopes that are above me as I travel.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable