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Observation: Porter Fork

Observation Date
12/16/2023
Observer Name
JP & DB
Region
Salt Lake » Mill Creek Canyon » Porter Fork
Location Name or Route
Porter Fork
Weather
Sky
Clear
Snow Characteristics
Snow Surface Conditions
Faceted Loose
Wind Crust
Melt-Freeze Crust
Snow Characteristics Comments
Mixed bag of conditions out there. Melt freeze crusts on the solar aspects that softened nicely in the sun, with quasi-corn forming on southern aspects. The east winds from earlier in the week got down into drainage bottoms and distributed windboard in some normally sheltered areas but soft recrystallized snow was generally the norm on shady slopes. The surface snow continues to weaken and some old wind crusts were starting to break down.
Red Flags
Red Flags
Recent Avalanches
Poor Snowpack Structure
Red Flags Comments
One small recent avalanche was observed, a dry loose at the bottom of the Raymond Slabs that was likely triggered by a past skier. Small debris pile, not enough to bury one. The weakening surface snow sluffed in steeper terrain, very manageable at this point but something to be aware of with continued faceting likely. Several pits revealed poor snowpack structure with a layer of facets about 20cm from the ground however this snow was not reactive in extended column tests and appeared to be healing in areas with over 4 feet of total snow depth.
Comments
Toured in Porter Fork today, covering quite a bit of ground on most aspects, but primarily NE through NW slopes. Dug five quick pits in various areas and frequently probed for snow depth to try to get a sense of where it could be possible to trigger an avalanche on the persistent weak layer. Surface faceting continues to weaken surface snow. In one pit (8,800 feet, NNE facing sheltered terrain) in an area with a snow depth of 85cm almost the top half of the snowpack was faceted and the thick slab from the December 2-3rd storm was beginning to break down.
The weakest snow we found was in a NW facing pit at 9500 feet. Snow depth here was 95 cm, likely on the shallower side from wind transport. Weak snow was about 20cm from the ground and still felt very dry and uncohesive, although it was not reactive in an extended column test. We were able to get a clean shear prying the slab off with a shovel with moderate force.
In deeper snowpack areas (N facing, 9400 feet) with snow depths of 125 cm we still found the faceted snow but it seemed to be getting more cohesive and gaining strength.
Only evidence of past avalanches was buried debris likely from 2 weeks ago in the middle part of Gary's Gully and a small dry loose avalanche that seemed recent that was likely triggered by a rider who skied or rode down the Raymond slabs lookers right of Piece of Pie. We experienced some minor sluffing of the surface snow, something to be aware of on steep north facing slopes with poor runouts.
Lots of spatial variability out there especially with the recent wind loading from the east wind event earlier this week.
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
Low
Coordinates