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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.08.18 Name: VandenBos Operation: SAC
 Drainage/Route:  Central Sawtooths Observed Terrain:   Zone/Region:  Sawtooth Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind:
 Blowing Snow: Snow Available for Transport:
 Comments: Overcast all day with flurries up to S1, though I'd be surprised if there was more than 1cm accumulation. Winds were strong and variable, tough to point at a prevailing direction. Plenty of old facets blowing around but not much fresh snow left for transport.
AVALANCHE OBSERVATIONS
None Reported
 Comments: No recent activity observed.
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Deep Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:
Unreactive

Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: 
STABILITY TESTS
 Stability Test Results: Dug on E through N aspects between 8,000' and 8,500'. ECTX (five tests in two pits), PST 38-42/100 down 1m (five tests in two pits). PST failing just above thanksgiving crust at ~1m depth.
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
 Comments (aspects and elevations of instability, etc): As far as likelihood goes we are headed toward the low end of the scale, but as far as travel advice goes, moderate still seems more appropriate.
FILE ATTACHMENTS

180208_SawtoothDeepPersistent_BV.jpg
PST 40/100 (End) down 95cm