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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.28.18 Name: VandenBos Operation: SAC
 Drainage/Route:  Imogene Observed Terrain:   Zone/Region:  Sawtooth Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind:
 Blowing Snow: Snow Available for Transport:
 Comments: Very light and intermittent winds, not transporting snow.
AVALANCHE OBSERVATIONS
None Reported
 Comments: Glassed the southern portion of the range, looked like there was a decent mid-storm cycle, as evidenced by mystery debris piles without crowns above them. One slide just north of Imogene likely failed 2/27 when a small wet sluff kicked off a slab below some steeper, rocky terrain. Loads of dry and wet loose activity around.
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:

Terrain
  Primary Concern Comments: 2/14
STABILITY TESTS
 Stability Test Results: ECTs in the low to mid 20's, variably propagating and not propagating. PSTs in the 40's/100, about 50% END and 50% ARR.
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
 Comments (aspects and elevations of instability, etc): Moderate at middle elevations, lower end of considerable at upper.