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Observation: Main Porter

Observation Date
12/29/2022
Observer Name
R. Kosinski
Region
Salt Lake » Mill Creek Canyon » Porter Fork » Main Porter
Location Name or Route
Porter Fork
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Collapsing
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments
PWL is still very present at this elevation. Overall the November facet layer makes up over half of the snowpack in this area and while it has been dormant lately, I wouldn't trust it over the coming week with the possibility of 50+" of snow and a couple inches of SWE.
Avalanche Problem #2
Problem
New Snow
Trend
Decreasing Danger
Problem #2 Comments
New snow overall has bonded alright and has rapidly gained strength. There is widespread D1 point releases in the higher angle terrain throughout Porter Fork which appears to have run en-masse during the very end of the storm cycle. I noticed some sluffing when skiing some higher angle slopes in the top of the new snow layer. On the South aspects, the snow got damp during the afternoon sun but overall remained cool with no evidence of wet loose problems.
Snow Profile
Aspect
North
Elevation
9,100'
Comments
Started touring this morning around 9:15 under partly cloudy skies, cool temps, and a couple cm of new snow. Getting to Porter Pass around 11:30, I experienced light winds gusting moderate out of the SSW, cold temperatures, and moderate wind transport along exposed ridgelines. There was extensive natural point-release cycle at the end of the storm yesterday with almost all high-angle terrain running. Looking into BCC, the only notable avalanche was a D2 point release out of lower Bonkers (Broads Fork). North aspects remained cool all day and skiing was very surfy and fun. South facing slopes also held up very well in the sun and allowed nice, creamy skiing. A party skiing a SE aspect around Porter Pass reported a loud, large collapse.
Looking below the surface, the snow in this area is in worse shape than favored areas like upper LCC. While in favored areas there is noticeable 'healing' in the snowpack, that is not true in Porter Fork. The base of the snowpack is beginning to bridge, but it is very sporatic. We will see a lot of spatial variability over the coming weeks as some areas will continue to gain strength while other areas will just begin to gain strength. With the series of storms coming over the next few days, I will continue to treat any west-north-east facing slope as suspect and keep to the areas <30°.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
High
Coordinates