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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.19.18 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: A dash of clear skies in the morning, then relatively thin, low clouds thickening in the late morning. Light snowfall starting around noon, increasing in intensity into the afternoon. Flurries up to S2 by the end of the day, total accumulation by sunset of ~3cm. Winds were calm but I didn't get up into true upper elevation terrain due to poor visibility.
AVALANCHE OBSERVATIONS
None Reported
 Comments: One wide but thin crown on Cabin Pk (?) in the southern Sawtooths.
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Primary Concern Comments: Wind had barely touched the snow at middle elevations in the past 24 hours. Did not encounter upper elevation slabs but suspect they are present.
 
Avalanche Characteristics
Character/Avalanche Problem:
Dry Loose

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 2 Comments: Would be a problem on anything steep with such low density, unconsolidated snow. It will be interesting to see if the sun today (2/20) will be able to get some solar initiated dry loose stuff moving or if cold temps will prevail.
 Comments: Structure is still there for deep persistent problem but its been a long time since I've seen any action on anything down on 12/2 or 12/19 in the Sawtooths.
STABILITY TESTS
 Stability Test Results:
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
FILE ATTACHMENTS

180219_CabinPkSS_BV.JPG