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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.20.18 Name: VandenBos Operation: SAC
 Drainage/Route:  Baker Creek, Silver Creek Observed Terrain:   Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: HST: 20-30cm Sky: VAR Precip: Temps:
 Ridgeline Wind: Calm
 Blowing Snow: Snow Available for Transport:
 Comments: Calm to very light winds (dead calm in the Boulders in the late afternoon, a rare treat).
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 Above Baker Lake 1.5 SS SE 9,000'
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Primary Concern Comments: Kind of a toss up between calling the recent activity wind or persistent slabs; what I looked at today above Baker Lake was a very subtly wind-stiffened slab on persistent grains.
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 2 Comments: Did not directly observe 12/2 or 12/19 on this tour but the suspect structure remains and is shallow enough here that it continues to warrant attention.
STABILITY TESTS
 Stability Test Results:
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)    
 Comments: Isolated cracking in Smokys on wind stiffened slopes. Widespread cracking at low and middle elevations in Boulders where recent snow had been whipped into slabs which sat on crust+facet combo.
SNOW STABILITY
 Snow Stability Rating for your observed area: Fair Confidence: Trend: