Observation Date
12/28/2014
Observer Name
Kobernik/Larson
Region
Salt Lake » Mill Creek Canyon » Wilson Fork » Wilson Glade
Location Name or Route
Spruces through Wilson Glade out Alexandar
Weather
Sky
Overcast
Precipitation
Moderate Snowfall
Wind Direction
West
Wind Speed
Moderate
Weather Comments
Bit gusty on top of Reynolds. Only a few periods of annoying wind speeds on the ridge approaching Wilson. Winds were more behaved than I anticipated. Intense snowfall rates from noon to around 3pm, otherwise moderate snowfall most of the day.
Snow Characteristics
New Snow Depth
4"
New Snow Density
Low
Snow Surface Conditions
Powder
Dense Loose
Snow Characteristics Comments

4" new on top of the bed surface from the avalanche in Wilson Glade at around 2pm. While there was only around 4 or 5 inches of new snow, it landed on powder so things seemed quite deep. Almost too deep in spots. Trail breaking was somewhat difficult and slow going.

Red Flags
Red Flags
Heavy Snowfall
Wind Loading
Poor Snowpack Structure
Red Flags Comments
True to form, things were getting sensitive during the intense snowfall. Things were starting to crack a bit and the newer snow was starting to entrain quite a bit when disturbed on steeper slopes. The sensitivity lessoned almost immediately after the snowfall let up a bit. Overall, the new snow was fairly well behaved. Minor new wind slabs that I'd rate as not very sensitive except during the high snowfall rates.
Snow Profile
Aspect
Southwest
Elevation
9,400'
Slope Angle
37°
Comments

Went up to attempt to look at the human triggered avalanche in the Wilson Glade. We were able to slide off the crown onto the bed surface on the west side of it. Good amount of hangfire still on the east half. This fits the pattern of all the recent avalanches from No Name through the PC Ridgeline, West Willow, and West Desolation. The weak layer is above a crust as well as the early season facets. It did not take out the early season facets. This is not what I would have anticipated before the high density snow storm. I figured we would've seen avalanches breaking into the early December facets.

On a side note, many people mistakenly think the Wilson Glade is a safe slope. This is not the case. It often harbors weak faceted snow due to it's shady north aspect. It is tricky because it does not give the appearance of a dangerous slope. However, make no mistake that it is plenty steep enough to slide. This slope caught a former UAC forecaster over 14 years ago. Here are a number of human triggered avalanches from the last few years:

12/27/2014 Salt Lake Wilson Glade Skier 3' 100 Northeast 9400 Density Change Details 03/8/2011 Salt Lake Wilson Glade Skier 21" 50 North 9900 New Snow/Old Snow Interface Details 02/21/2010 Salt Lake Wilson Glade Skier 10" 80 Northeast 9000 Surface Hoar Details 01/25/2010 Salt Lake Wilson Glade Skier 2.5' 350 Northeast 9800 Details

Overall avalanche danger is hard to pinpoint due to some slopes being stable and some not. Lots of variability from place to place but difficult to assess which are which. Personal pucker factor made me turn down the east facing Reynolds shoulder, Wilson Chutes as well as the Wilson Glade where we only sneaked onto the old bed surface and did not ski the main run. I need to let the weak layers settle and stabilize a bit more before I feel comfortable on a number of my favorite slopes.

Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable
Coordinates