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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.15.18 Name: Wieland Operation: SAC
 Drainage/Route:  Smiley Ck Observed Terrain:  7300-9800 Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 3-9cm HST: 3-9cm Sky: BKN Precip: Temps:
 Ridgeline Wind: Light from the NW
 Blowing Snow: Prev Snow Available for Transport:
 Comments: Mostly cloud skies in AM, but somehow was in the sun for a good portion of the day. Cloud dissipating in the afternoon except for in the Sawtooths. New snow very low density and would easily move with a small uptick in wind velocities.
AVALANCHE OBSERVATIONS
None Reported
 Comments: Observed some older and mostly covered debris from avalanches with no visible crown lines.
SNOWPACK OBSERVATIONS
 HS: 100-160cm 
 Upper Pack: Variable HST found in short distances in head of Mill Gulch. HST resting over some older wind hammered surfaces in windier terrain, solid 2-10cm MFcr on solars and thin to no MFcr on E/W margins. Shady had DF/Fc mix under new snow. 
 Middle Pack: 12/19 found 100-110cm from surface with thanksgiving crust down 110-120cm. 12/19 1F in E and SE and rounding. No other significant layers found.  
 Lower Pack: n/o below Turkey Day crust. 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:
2/14

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:
Specific
Terrain
  Primary Concern Comments: Wind had not moved much snow in this area. Any loading was in exposed gullies and lee to N through W wind and not near ridges. Plowed through a few very low density drifts with no cracking.
 
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
12/19

Likelihood of Triggering
Sensitivity:
Unreactive

Spatial Distribution:
Widespread
Terrain
  Problem 2 Comments: Probing found this layer in most areas with pits showing good stability. Did not dig in any
STABILITY TESTS
 Stability Test Results: ECTP 12 down 30cm on a shallow older wind slab in one pit. ECTX below
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
 Comments (aspects and elevations of instability, etc): MOD due a few wind slab. We did not travel through any larger ones as they were in rocky terrain.
BOTTOM LINE
 Comments: Overall, wind did not move much snow in this area and all wind slabs were easily avoided with most not found near ridges. Some cornices were large but handled the weight of snowbikes just fine. Observed a few small sluffs running in terrain over 40° but wasn't able to get anything moving while travelling in similar very steep terrain. Did not observe any fresh slab avalanches. Some other sluffs observed near basin at head of Salmon river headwaters and near Cabin Pk. Weak layer depths similar to 2/11 VandenBoss ob. Traveled through a variety of terrain with few worries other than avoided obvious recent wind slabs which were in consequential areas anyways. Still avoided start zones that had trees/rocks in runouts.