UDOT PLANNED AVALANCHE CLOSURES!!

Observation: Uintas

Observation Date
12/11/2019
Observer Name
jg
Region
Uintas
Location Name or Route
Duchesne Ridge
Weather
Sky
Broken
Wind Direction
South
Wind Speed
Light
Weather Comments
Mostly could skies in advance of the next weakening weather disturbance. Light winds not moving snow. Temps in the mid teens to mid twenties.
Snow Characteristics
Snow Surface Conditions
Powder
Snow Characteristics Comments
Cold December snow conditions, even on slopes facing the south half of the compass. Soft, shallow powder on a supportable base. Surface hoar formation in the typical low elevations sinks but widespread surface and near surface faceting on all aspects, but most prevalent on slopes facing the north half of the compass. Rime in the trees and some rimed surface snow on west facing slopes.
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
No visual or audible red flags until I started digging in the snow to reveal the poor snowpack structure.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments
We'll be trending toward increasing danger with more snow and wind in the forecast but it may not be until Friday that we see the persistent weak layer start to wake up.
Snow Profile
Aspect
East
Elevation
9,700'
Slope Angle
30°
Comments
We dug a pit on an ENE aspect at about 9700 ft. There's just over 30 inches of snow in this location with about 20 inches of denser snow sitting on a foot of early season, loose facets - strong over weak. Pit tests were mostly failing on faceted grains below a temperature crust within the basal facets about 55 cm's down (22""). Our Extended Column Test failed with medium effort on 2 mm solid faceted particles and with plenty of energy to pop the column out into the pit on a 30 degree slope. The slab resting on the weak basal snow is firm and supportable and certainly gives you the feeling of a solid snowpack. It's not until you dig into the snow that you're able to see the poor structure.
Tomorrow's danger rating will depend on how much wind and new snow we get. I went with moderate danger again tomorrow. Winds are forecasted to relatively light from the north tonight but, tomorrow, turn to more southwesterly, blowing at moderate speeds. With plenty of soft snow available for transport, northerly facing slopes may see some loading tomorrow until the winds shift and start blowing from the northwest. We most likely will see a considerable danger for Friday and into the weekend on slopes 30 degrees or steeper facing the north half of the compass.
First photo is our ECT result and second photo is rime on the trees.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate