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PROFESSIONAL OBSERVATION FORM
 Start Date: 12.14.16 Name: Savage Operation: SAC
 Drainage/Route:  Baldy OB Observed Terrain:  above 8500', SE-E-NE-N-NW Zone/Region:  Wood River Valley
WEATHER OBSERVATIONS
 HN24: 0 HST: 0 Sky: X Precip: Temps: 20's F
 Ridgeline Wind: Light and Intermittent from the SW
 Blowing Snow: Prev Snow Available for Transport: Small amounts
 Comments: Just starting to snow lightly at 1200hrs when I left
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
SNOWPACK OBSERVATIONS
 HS: 30-50cm 
 Upper Pack: DF with some wind effect in places 
 Middle Pack: DF and some MF/FC 
 Lower Pack: FC, some depth hoar, some decomposing crusts 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:
Not Observed

Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: basal FC, thinking they just need a new load
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:
Not Observed

Spatial Distribution:
Specific
Terrain
  Problem 2 Comments: mid pack FC, responsible for collapsing on shady aspects at top of Baldy OB on north side of boundary
STABILITY TESTS
 Stability Test Results:
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)   Length: 10m
 Collapsing (isolated) Depth: 20 and 30 Length: 100m
 Comments: rolling collapse just above steep starting zone where Baldy accident occurred last year
SNOW STABILITY
 Snow Stability Rating for your observed area: Fair Confidence: MODERATE Trend:
 Comments (aspects and elevations of instability, etc): Would have avoided any steep wind-loaded slopes, especially where October snow exists. Not enough snow to fully cover the sage yet in many places, so slopes without early season snow (old FC) have a decent looking snowpack. Better stability and less danger where no wind effect/softer slab.
BOTTOM LINE
 Comments: Thin snowpack. Not much of a load on top of the weak layers but still able to get rolling collapse in untouched terrain. Nice weak layer of FC and decomposed crust where old snow exists is just waiting for a load to go off...likely on Thursday and Friday. Video with pit and my thoughts posted on SAC website.