Avalanche: Roberts Horn 12/12/2010

Observer Name:

Nalli

Observation Date:

12/12/2010

Occurrence Date:

12/12/2010

Occurrence Time:

10:00am

Region:

Provo
Provo Canyon
North Fork
Roberts Horn

Location Name:

Roberts Horn

Location

40° 24' 7.7652" N, 111° 37' 52.3992" W

Avalanche Characteristics

Elevation:

9000'

Aspect:

East

Slope Angle:

Trigger:

Natural

Avalanche Type:

Soft Slab

Weak Layer:

Graupel

Depth (avg):

12"

Width:

100'

Vertical:

200'

General Comments

This SS-N-R2,D2-S looks to have been triggered by a WL slide from close to the ridgeline. You can see that the WL found a couple small pockets of new windslabs on its way to the apron before triggering the larger slide below the cliffs. Based on the location its possible that pooling graupel was the weak layer.

General Comments 2

A closer look at the slab below the cliffs.

General Comments 3

A look at one of the many WL slides that occurred on E-S aspects today with the first of the morning sun. This is on a SE aspect at 9800' in Roberts Horn. Not really that big, but when running through complex terrain, can add up to big debris piles.

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