Avalanche: Upper Weber Canyon

Observer Name
CBrown
Observation Date
Friday, December 16, 2016
Avalanche Date
Friday, December 16, 2016
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.

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