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Observation: Pleasant Creek

Observation Date
1/10/2020
Observer Name
John Pikus & Zeb Engberg
Region
Skyline » Pleasant Creek
Location Name or Route
Pleasant Creek
Weather
Sky
Clear
Wind Direction
West
Wind Speed
Light
Weather Comments
Impeccably beautiful and cold afternoon with clear skies and little to no wind.
Snow Characteristics
New Snow Depth
8"
New Snow Density
Low
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments
On north aspects we found up to 8 inches of low density snow on top of a soft yet supportable base. Wind had moved some snow around recently, and we found both very hard windslabs (presumably from the strong southerly winds last week) and newer-looking softer ones in exposed areas.
Red Flags
Red Flags
Wind Loading
Cracking
Red Flags Comments
I was able to get one small wind drift to crack out on me while making a turn. Outside of wind affected areas the new snow seemed to be well behaved although it was sluffing on any steep slopes. We also noted small natural point releases on steep south facing slopes across the canyon.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #1 Comments
We noted both cross-loading and scouring on north facing aspects from winds overnight. One instance of cracking leads me to believe that if you were in the wrong place today these would be sensitive. Overall this only seemed to be a problem in high exposed areas within 200 vertical feet or so from ridgelines. In most areas the snow was unaffected by the wind.
Comments
We toured this afternoon on north, northwest, and northeast aspects at elevations ranging from 7,500 to 10,000 feet. We found a generally stable snowpack outside of wind affected zones but did note shallower pockets where the snowpack was weak and unsupportable. Consistent pole probes revealed this layer in several places from about 8,500 feet to 9,000 feet on north aspects but we did not find this problem anywhere where the snowpack was a little bit deeper. As we increased in elevation the layer became less and less prevalent.
We dug a full pit to the ground on a NNE aspect at 9,500 feet and found a very solid and supportable snowpack (see photo below.) Total snow depth was 110cm in this location with 20cm of new snow from the past two days. We did not find any buried surface hoar or near surface facets in this location and the new snow did not form a slab. It did seem like the snow before the Christmas storms weakened a little bit during the period of high pressure but this layer was not reactive in ECTs and we were only able to get failure by prying the whole column out with moderate to strong force. We had no failures on any layers in tests. Basal facets are still present but seem to be healed in this location. Photo 2 shows the layer that we were able to get failure on by prying with the shovel. Seems like something worth keeping an eye on especially in areas with a shallower snowpack.
Overall we were pleasantly surprised with the state of the snowpack here. The new snow did sluff very easily but there isn't really enough of it yet to be a problem. We skied some steeper slopes in the 35-40 degree range out of wind affected areas with no problems. Tomorrow I'd say moderate to considerable danger depending on how early the storm comes in and how strong the winds are with it.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates