Close
PROFESSIONAL OBSERVATION FORM
 Start Date: 01.12.18 Name: VandenBos Operation: SAC
 Drainage/Route:  East shoulder Williams Observed Terrain:   Zone/Region:  Sawtooth Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind: Light and Intermittent
 Blowing Snow: Snow Available for Transport:
AVALANCHE OBSERVATIONS
None Reported
SNOWPACK OBSERVATIONS
 HS: 150cm 
 Upper Pack:  
 Middle Pack:  
 Lower Pack:  
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Primary Concern Comments: 
 
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 2 Comments: 
 Comments: More concerned about persistent today, but did not spend time in wind affected avalanche terrain.
STABILITY TESTS
 Stability Test Results: ECTP21 and ECTP24, both down 93cm (different columns). PST 32/100 END down 93cm. Early-mid December facets (between 12/2 and 12/19 interfaces) are bonding to the slab above and 12/2 interface is becoming primary layer of concern for deeper persistent issues.
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)    
 Collapsing (isolated)    
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
 Comments (aspects and elevations of instability, etc): Avoided avalanche terrain today.
FILE ATTACHMENTS

DSC_0842.JPG
D2s, southern Boulders.

DSC_0862.JPG
Easley Creek debris, Boulders.

DSC_0916.JPG
Alturas persistent slabs, Sawtooths.

DSC_0965.JPG
Persistent and wind slabs above Meadow Bowl, Sawtooths. Crowns are somewhat filled in with later snow but are sizeable. Easily D2.5.

DSC_0974.JPG
Persistent and wind slabs above Meadow Bowl, Sawtooths. Crowns are somewhat filled in with later snow but are sizeable.

DSC_0998.JPG
North-central Sawtooths wind slab on persistent weak layer. Size D2.5 or greater.

DSC_1013.JPG
ECTP21 down 93cm.

DSC_1018.JPG
PST 32/100 END, down 93 cm.