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Observation: Pt. Supreme

Observation Date
12/4/2017
Observer Name
Cbrown
Region
Salt Lake » Little Cottonwood Canyon » Alta Ski Area » Pt. Supreme
Location Name or Route
Point Supreme
Weather
Sky
Obscured
Precipitation
Light Snowfall
Wind Direction
West
Wind Speed
Light
Weather Comments
Sky cover went from obscured to few short periods where the sun popped out. Thin clouds passing through with continuted light snowfall throughout the day. Picked up a few additional cms during the day.
Snow Characteristics
New Snow Depth
14"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments

About 10-14" of light density snow around 10,500', made for decent riding conditions on lower angle slopes with old snow. The old crust seemed supportable when keeping the slope angle moderate. Did not observe any wind slab formation first hand, but did see some areas that looked like there may have been some windslab. The new snow was unconsolidated and was not forming a slab, and did not appear to be a significant enough of a load to activate the poor snowpack structure.

The crust seemed fairly strong (P-K) about 1 cm thick at 10,200 on a NW aspect. Near crust facets below the crust and some faceting graupel. Could find a thin layer 1-5 cms of basal facets/cupped striated depth hoar on the ground. There was about 115 cm snowpack at the 10,200 NW location with the basal layer, facets, some faceting graupel (appeared to be from 2 separate storms/events), the crust with definite near crust facets below (layer of concern moving forward), and about 35 cm of new snow sitting on the crust.

I think with additional load on the thin crust with the weak snow below we will start to see avalanches. I think this could fail on the near facet crusts and be able to gouge down into the weak facets and faceting graupel layer.

Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
There was more new snow than I anticiapated but this was not a significant enough load in the nonwind affected areas I traveled. The snow pack strucutre is weak and going forward this will be an issued that we will be having to manage. I did not see any significant wind loading and did not observe windslabs but I would think they are out there due to the wind during the storm. The snow is light and more than enough avaialble for transport.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #1 Comments

Although not observed I believe there are wind slabs out there and a small wind slab avalanche with our shallow and poor snowpack could have devisating results to a rider.

Comments

First picture is of 115cm quick pit at 10,200' NW, second picture is closer image of faceting graupel, last picture is the pack close to the ground.

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate