Fraser Ridge

Snowpack

Eirik Sharp ACMG · Dec 2, 2016 · White Pass West

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Observation photo 1

Quick report

Weather
warm, stormy
Ride Type
openTrees, mellowSlopes
Riding Quality
ok
Snow Conditions
deepPowder
Avalanche Conditions
avalancheConditionSnow

Deep snow and no base made trail breaking and downhill travel difficult.

Snowpack

Depth
90
Obs Type
point
Site Aspect
N
Site Elevation
11
Ski Penetration
50
Test Initiation
moderate
Foot Penetration
80
Test Failure Depth
60
Site Elevation Band
tln
Surface Conditions
newSnow, variable
Test Failure Layer Crystal Types
facets

60 cm of low density storm snow sits above a layer of facets. Hand shears and compression test results identified this as a layer of concern. A thick crust can be formed down 70cm. We performed a rutcsh block test and got a score of 6 on the storm snow/facet interface (failure upon stepping down to the middle of the block). This failure was fast and energetic and I suspect that as the storm snow gains slab properties (through settlement or increased load) this layer of facets could become more reactive. As the day progressed we began to see shooting cracks on unsupported features, a good signs that the storm snow was gaining slab properties.