Close
PROFESSIONAL OBSERVATION FORM
 Start Date: 02.22.18 Name: VandenBos Operation: SAC
 Drainage/Route:  Butterfield Observed Terrain:   Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind:
 Blowing Snow: Snow Available for Transport:
 Comments: Brief afternoon tour, 1530-1630. Snowing S1 to S2 throughout, 8-10cms of fresh at highway, 15+cm at highpoint of ~8,000'. Light winds, but it doesn't take much to move snow like this...
AVALANCHE OBSERVATIONS
None Reported
 Comments: None observed, terrible visibility.
SNOWPACK OBSERVATIONS
 HS:  
 Upper Pack: 10-15 cm HST, on ~30cm PP from earlier in the week, on .1-2cm IFrc (decreasing thickness with elevation, tapered out around 8,000'), on 10-15cm FCsf from cold temps and open skies before Vday. 
 Middle Pack:  
 Lower Pack:  
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Primary Concern Comments: New snow from past week is resting on FCsf from cold temps and clear skies last week. IFrc caps FCsf in this location, up to ~8,000'. (did not observe upper elevations, hence lack of upper elevation shading
 
Avalanche Characteristics
Character/Avalanche Problem:
Storm Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 2 Comments: New snow is cohesive and poorly bonded to FCsf developed in past few days. Where more snow has fallen this is more likely to be a problem. (did not observe upper elevations, but suspect it is a fair bet that more snow has fallen at upper than at lower).
STABILITY TESTS
 Stability Test Results:
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Cracking (isolated)    
 Comments: Cracking in new storm snow.
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend: