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Observation: 10420

Observation Date
1/20/2018
Observer Name
U of U Level 1 Avalanche Course / Bernstein
Region
Salt Lake » Big Cottonwood Canyon » 10420
Location Name or Route
10420
Weather
Sky
Overcast
Precipitation
Moderate Snowfall
Wind Direction
Northeast
Wind Speed
Light
Weather Comments
At 0900 at the guardsman gate, there was 20 cm of new snow at 8900', the sky was completely obscured, and there was no wind. At 11:20 there was 30 cm of new snow at 9850' on the NW ridge of 10420, the sky was overcast, and there was light wind. At 1530, there was 30 cm of new snow at the guardsman gate. Throughout the day, we saw fairly consistant s2 snowfall with wind varying from calm to light. Ski Penetration stayed fairly constant at 30 to 35 cm thoughout the day.
Snow Characteristics
New Snow Depth
12"
New Snow Density
Low
Snow Surface Conditions
Powder
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Poor Snowpack Structure
Red Flags Comments
We found the same poor snowpack structure documented by Mark Staples on 2018 01 19. There is a density change about 10cm up from the old/new snow interface that didnt seem to be bonding well, with Q2/Q3 cracks on CT2 and CT3. We also got Q2 and Q3 results in the mid CT20's on various layers throughout the middle pack. None of our ECT's propogated, but we did get a PST 43/100 END, 75cm down from the surface on a NNE slope at 9850 off the nw ridge. Also, at 9850' we found HS125 through HS 140 on a sheltered N and NE aspect.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Considerable