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Observation: Skyline

Observation Date
3/8/2013
Observer Name
Darce Trotter/ Steve Cote
Region
Skyline
Location Name or Route
Boulger Canyon
Weather
Sky
Obscured
Precipitation
Light Snowfall
Weather Comments
storm has not reached the Plateau, seems like there is just not enough energy or wind to get the precip going yet. Warm days and sun have crusted all but the most sheltered North facing areas, rain/snow line today was about 6500', temps in the high 20's at 9000'.
Snow Characteristics
New Snow Depth
2"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments

highly variable surface conditions, one minute you are on supportable base with 3"-4" of creamy powder, then onto breakable crust, to weaker faceted snow that would swallow you whole if you go too near a tree well or even brush beneath the snow (now hard to know where).

In the area we headed for today, total pack was some of the deepest we have seen, a solid 55"+, but again, would vary wildly. We did not experience any collapses or cracking, but no real slab exists in most of the terrain we covered today. On our upstracks we quickly learned to stay away from tree wells where you would immediately be sandboxing up to your knees, but if we stayed in more open terrain or took advantage of snow pillows/whales blown into and between the trees, the snow was supportable. we did not feel the deeper pack hold any surprises other than the variability, and were on slope angles > 35. This all made for some interesting skiing to say the least

we also felt the newer snow on the surface was bonded to crusts well, but did have a CT failure at 15 just below the crust. On ECT, failure again was visible, but would not propagate, and adding the widespread variability in structure, it would be very hard to get something to connect and create a problem

Hazard in similar areas will be the new snow and how well it bonds to old, and of course, windloading, once the storm gets going.

as for today, not much going on, warm temps have settled things out, waiting for the next storm.

Red Flags
Red Flags
Wind Loading
Red Flags Comments
new snow and wind will be the only issues, have to wait and see how much we get
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #1 Comments

We were only in the sheltered areas today and cannot ignore we continue to have avalanches and accidents on steep east facing, rocky, higher elevation slopes with shallow pack, and with new snow loading coupled with wider spread faceting, danger will be rising and would not be surprised to see both natural and unintentional activity over the weekend.

Avalanche Problem #2
Problem
Cornice
Trend
Increasing Danger
Problem #2 Comments

always an issue on summit ridges, growing quickly with wind and new snow

Snow Profile
Aspect
West
Elevation
9,100'
Slope Angle
30°
Video
Coordinates