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PROFESSIONAL OBSERVATION FORM
 Start Date: 12.23.18 Name: VandenBos Operation: SAC
 Drainage/Route:  Frenchmans Observed Terrain:  to 9600' Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 1cm HST: Sky: OVC Precip: S-1 Temps:
 Ridgeline Wind: Calm
 Blowing Snow: Snow Available for Transport: Small amounts
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 Frenchman's Within past week 2 SS N N 9000 Tough to know for sure without visiting the crown but this may have failed on a deeper layer in the pack (basal DH), crown depth was at least 2 feet
 1 Frenchman's Within past week 1 SS N N 9300 Small wind slab from the past few days.
SNOWPACK OBSERVATIONS
 HS: 80-90cm 
 Upper Pack: 30 cm PP and DF from the past week 
 Middle Pack: Snow from Thanksgiving storm has consolidated into a decent slab (as dense as 1F) but is starting to facet away under current conditions.  
 Lower Pack: 5-10cm basal DH. DH seemed less structured here than in other areas. May just be that the crust associated with the DH is finally faceting away. 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: 11/22 DH. 12/11 interface does not seem terribly problematic here, particularly without SH, which I looked around for but did not find.
STABILITY TESTS
 Stability Test Results: for SW and NW aspects: ECTNs in the teens on 12/11 interface, no SH found at this interface. ECTPs in the low-20s and PSTs in the 20's/100 END on DH
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)    
 Collapsing (isolated)    
 Comments: Less cracking and collapsing than I've been seeing in our southern zones and than I saw earlier this week on McDonald.
SNOW STABILITY
 Snow Stability Rating for your observed area: Fair Confidence: Trend: