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Observation: Flagstaff Ridge

Observation Date
12/30/2015
Observer Name
sarge
Region
Salt Lake » Little Cottonwood Canyon » Flagstaff Ridge
Location Name or Route
Direct south line to Flagstaff ridge.
Weather
Sky
Overcast
Weather Comments
Fog in and out, cold!
Snow Characteristics
New Snow Depth
1"
New Snow Density
Low
Snow Surface Conditions
Powder
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
1.5 to 2.5 mm rounded sintered facets in the basal layer from 5 to 10 cm thick at this data point. Not really an issue but I list it as it's the persistent layer we are all tracking.
Avalanche Problem #1
Problem
Persistent Weak Layer
Problem #1 Comments
Low probability due to the necks and bounds forming in the rounded facet layer at the ground (old depth hoar). CT29 Non-Planar Break in this sintered basal facet layer. Measured a 10 degree C temperature gradient over the 1.05 meter snowpack. This is in the zone for more faceting, we'll see how cold and for how long. This is being offset by the compressive force of the snow above compacting this layer.
Snow Profile
Aspect
Southeast
Elevation
9,700'
Slope Angle
35°
Comments
Dug this pit right next to the skin track which was directly in the line of fire for that slide path. I know stability is good but considering the spatial variability of the deep slab persistent layer, and the high consequence of an event, I would suggest better skin track setting practices (it's no more work to set a proper track).
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
Low
Coordinates