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PROFESSIONAL OBSERVATION FORM
 Start Date: 12.26.16 Name: Davis, Liles Operation: SAC
 Drainage/Route:  Salt Bowns Observed Terrain:  5600-7300, all aspects Zone/Region:  Soldier Mountains
WEATHER OBSERVATIONS
 HN24: 0 HST: 30 Sky: FEW Precip: Temps: n/o
 Ridgeline Wind: Moderate from the NW
 Blowing Snow: Prev Snow Available for Transport: Small amounts
 Comments: Valley fog burned off by mid-morning. Mostly sunny day. Inverted temps and locally calm wind.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 15 Mountains and Foothills near Soldier Mountain Within past week 1 HS N <8500' SW-S-E aspects
 1 Peak NE of Smoky Dome Within past week 2 HS N E 9500' 200'W x 300'L
 Comments: All of the observed avalanche activity was south of the N. Fork of Soldier Creek. We glassed and shot photos with a long lens all the way toward Skeleton and Big Peak and saw nothing of interest.
SNOWPACK OBSERVATIONS
 HS: NE @ 7200': 80 cm 
 Upper Pack: Surface Hoar
 Middle Pack: 4F-4F+ 
 Lower Pack: F
Bottom 5 cm FC and DH sz 3 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:
40-80

Likelihood of Triggering
Sensitivity:
Not Observed

Spatial Distribution:
Specific
Terrain
  Primary Concern Comments: D1's on many slopes that ran during the storm. Did not travel in heavily wind affected terrain.
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
0

Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Widespread
Terrain
  Problem 2 Comments: SH to size 15. Observed up to 7200'. Accompanied by a rime crust at lower elevations.
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
40

Likelihood of Triggering
Sensitivity:
Touchy

Spatial Distribution:

Terrain
  Problem 3 Comments: Small FC. Lacked a slab to propagate in this location. I'd expect this layer to exist on other shaded slopes W-N-E.
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
80

Likelihood of Triggering
Sensitivity:
Unreactive

Spatial Distribution:
Widespread
Terrain
  Problem 4 Comments: Basal FC and DH sz 3. No results in column tests, no recent avalanche activity.
STABILITY TESTS
 Stability Test Results: NE @ 7200': ECTN (x2), CT8 (SP) down 40 on FC sz 1 (x3)
SNOW STABILITY
 Snow Stability Rating for your observed area: Good Confidence: HIGH Trend: Improving
BOTTOM LINE
 Comments: Lots of activity in the windier southern half of the zone and little snow left to blow around. No activity to be seen in the northern half wind large amounts of SAFT.
FILE ATTACHMENTS

161226_Slab_E_9500.jpg
Slab NE of Smoky Dome. Estimated 200'W x 300'L

161226_WindLoading.jpg
Dramatic wind-affect at lower elevations.

161226_WindLoadingCracking.jpg
Several small slabs and loose slides were observed in this type of terrain.