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PROFESSIONAL OBSERVATION FORM
 Start Date: 04.13.18 Name: VandenBos Operation: SAC
 Drainage/Route:  McDonald Peak Observed Terrain:   Zone/Region:  Sawtooth Mountains
WEATHER OBSERVATIONS
 HN24: HST: 15cm Sky: CLR Precip: Temps:
 Ridgeline Wind: Light and Intermittent from the W
 Blowing Snow: None Snow Available for Transport: Small amounts
 Comments: Clouds building to the west by mid afternoon, but not significantly affecting solar input. Air temperature remained relatively cool throughout day
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 Many 1 WL S Many small, natural, wet loose slides released during the day on the south half of the compass.
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:
30cm

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:

Terrain
  Primary Concern Comments: Most concerning where fresh slabs are deposited directly on slick, icy crusts
 
Avalanche Characteristics
Character/Avalanche Problem:
Wet Loose

Layer/Depth:
15cm

Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Specific
Terrain
  Problem 2 Comments: Solar induced
 
Avalanche Characteristics
Character/Avalanche Problem:
Wet Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 3 Comments: Snowpack was quite moist in the upper 2' up to ~8,500' or a bit higher. Plenty of water had worked its way down to the several crusts that exist in the upper bit of the snowpack (see photo)
STABILITY TESTS
 Stability Test Results:
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)    
 Comments: Very isolated cracking in fresh wind slabs
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
FILE ATTACHMENTS

180413_ElCapWL_BV.JPG

180413_WaterPerc_BV.JPG