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Observation: Snowbird periphery

Observation Date
11/27/2014
Observer Name
SZW/Rex
Region
Salt Lake » Little Cottonwood Canyon » Snowbird periphery
Location Name or Route
West Facing Upper Gad Valley, LCC
Weather
Sky
Overcast
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Skuddy weather day with warming temps. High clouds increasing throughout the day with increasing WNW winds. Gusts on the highest peaks in the 30s. Not much snow pluming of peaks due to warmer temps and settlement.
Snow Characteristics
New Snow Depth
1"
New Snow Density
Medium
Snow Surface Conditions
Dense Loose
Snow Characteristics Comments
The snowpack has undergone some changes over the last few days since the blockbuster of a storm we received. The riming event on Tuesday and into early Wednesday left some interesting rime crusts in places not exposed to high wind, although they seemed to break down with warming on Wednesday afternoon. The upper elevation west-facing slope we were on had myriad textures from wind ripples to rounded pillows. The surface temp was -.01C and S-20 was -2.7C. A pencil hard 1cm wind crust was present where we dug our snowpit. Total depth was 85cm (65 cm of consolidated 4F to 1F rounds sitting atop 4F- facets). Our pit tests came up with the same results of Q1 failures at 20cm from the ground failing on faceted early November snow resting on top of a thin sun crust that capped the faceted Halloween snowstorm. In fact, we heard a faint collapse when we stepped out of our skis to dig. Slope angle averaged 33 degrees.
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Wind Loading
Collapsing
Poor Snowpack Structure
Red Flags Comments
All the flags are flying and poor structure has been the name of the game.
Avalanche Problem #1
Problem
New Snow
Trend
Same
Problem #1 Comments
It seems the the upper layers of the pack on this aspect were starting to gain strength, but it is all sitting on top of 1-2mm facet grains capped with a sun crust.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Same
Problem #2 Comments
Saw the formation of some small cross loaded windslabs near minute terrain features, but they were a secondary concern other than that over time they may allow you to get farther out onto the slab before total failure of the snowpack.
Snow Profile
Aspect
West
Elevation
9,800'
Slope Angle
33°
Comments
This slope is within the ski area boundary of Snowbird, but has had no skier compaction or avalanche mitigation performed. ECT performed by SSP
Video
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable
Coordinates