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Observer Name: 
CBrown
Observation Date: 
Friday, December 16, 2016
Occurrence Date: 
Friday, December 16, 2016
Occurence Time: 
12:30pm
Region: 
Upper Weber Canyon
Location Name or Route: 
Upper Weber Canyon
Elevation: 
10500
Aspect: 
North
Slope Angle: 
42
Trigger: 
Skier
Trigger: additional info: 
Cornice Triggered
Avalanche Problem: 
Deep Slab
Depth: 
4'
Width: 
40
Vertical: 
Unknown
Comments: 

Full depth deep slab avalanche R4 D2.  Partner dropped a small soft cornice onto a steep starting zone (~45+*) which triggered the new storm slab.  This then stepped down to the mid-pack weak layer (guessing a buried NSF layer similar to that being seen in the Wasatch).  Then stepped down again to the ground on what I am assuming is old buried weak snow (pre-Thanksgiving day storm, being a upper elevation steep rocky north facing chute, this is exactly where I would suspect there to be a more substantial layer of more developed basal facets then seen elsewhere).  The majority of the chute was ~42*.  

Comments: 

Continuing down the ridge reveled that the next 4-5 chutes had gone through a natural cycle very recently.  2-3 of the chutes had just released, and the next 2 had some snow that had started to fill in again (possibly went last night or earlier in the day).  I believe this shows similar areas in the Uintas are right on the tipping point of producing nasty full depth deep slab avalanches.  All that is needed is a little more weight from additional snow, wind transport, cornice fall, or the delicate tap from a skier or rider.

Coordinates: 
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