Avalanche: Meadows 11/21/2010

Observer Name: 
Nalli
Observation Date: 
11/22/2010
Occurrence Date: 
11/21/2010
Occurrence Time: 
3:00pm
Region: 
Salt Lake
Big Cottonwood Canyon
Silver Fork
Meadows
Location Name: 
Silver Fork Meadows ( chute below football field )
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Location

40° 36' 48.2364" N, 111° 37' 33.8592" W
Avalanche Characteristics
Elevation: 
9200'
Aspect: 
Northeast
Slope Angle: 
38
Trigger: 
Skier
Trigger: additional info: 
Unintentionally Triggered
Avalanche Type: 
Soft Slab
Weak Layer: 
Graupel
Depth (avg): 
12"
Width: 
50'
Vertical: 
200'
General Comments

After a full day of skiing the gentler lines high in the meadows we exited the chute below the football field. Our group split up from 5 to 2 skiers for one more run. On the exit, the two of us regrouped mid slope for a better visual spot. Where to slope steepens, I placed a ski cut with no results and then continued to ski out. Four turns into the steeper slope, the slide released 30' above me and slowly gained speed. It may have started as a LS and then triggered a slab. The leading edge of the LS slide hit me and pushed me down slope a bit when I realized what was happening and skied hard to the right. The main flow picked up speed and traveled down slope another 150' vertical leaving 3'-4' of debris. Close call especially because of the numerous trees, brush and rocks to hit in this zone. No pics due to the bad visibility.

General Comments 2

The pack above 9500' in the meadows is overall stacking up very nicely. Dense moist snow at the ground, gradual lowering densities as it goes up until about 12" from the surface where there is 3"-4" of lighter density snow and graupel from late friday night and then dense windblown to the surface from the last 48 hours. HS is about 1m. Numerous large collapses were felt throughout the day mostly on the steeper breakovers and around buried brush. Below about 9500' the recent new snow is much more dense and the layering is more stratified.

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