Observation: Park City Ridgeline

Observation Date
1/18/2021
Observer Name
Paradis
Region
Salt Lake » Park City Ridgeline
Location Name or Route
Park City Ridgeline
Weather
Sky
Broken
Precipitation
Light Snowfall
Wind Direction
North
Wind Speed
Light
Weather Comments
Light snow and some riming on trees. Sun started to come out a little more around mid-day. Weather stations along the PC ridgeline are about 1000 feet lower than higher peaks in the Cottonwoods and did not show the same very strong overnight winds. That said, there was still some evidence of scouring in places.
Snow Characteristics
New Snow Depth
1"
New Snow Density
Medium
Snow Surface Conditions
Faceted Loose
Melt-Freeze Crust
Snow Characteristics Comments
Snow was generally poor. Travel was from between 8700 feet and 10000 feet. Aspects other than north had a thin temperature crust from earlier in the week. The strength of this varied. In some places it was supportable but not so much elsewhere.
North aspects were half faceted and gave skiing sort of that 'trap door' feel where your skis would cut through the new snow, then sink into the facets. This was also noticeable when skinning through thin areas. You would just sink into the facets. Twice I even tipped over as I sank into the bottomless facet pit. Boot penetration was basically to the ground.
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
Bottomless facets. In particular, along ridgelines where the snow is naturally thinner it is now so thin, that any new load will be easy to avalanche. See photo below.
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
No surprises here. As noted above, the facets were evident just traveling around. I dug a quick pit at about 9000 feet and found about 35-40cms of facets making up about half of the 80 cm snow depth.
Avalanche Problem #2
Problem
Normal Caution
Trend
Same
Problem #2 Comments
Snow is still really thin so stumps and rocks are still a concern.
This is probably 20 vertical feet down from the Sheep Shit ridgeline in a relatively sheltered area. Total snow depth is only 12-16" deep. About half of that is facets.
1.5 - 3 mm facets
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates