Avalanche: Upper Weber Canyon

Observer Name
CBrown
Observation Date
Friday, December 16, 2016
Occurrence Date
Friday, December 16, 2016
Occurence Time
12:30pm

Region:

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