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PROFESSIONAL OBSERVATION FORM
 Start Date: 01.25.19 Name: Lundy Operation: SAC
 Drainage/Route:  Beaver Creek Observed Terrain:  7200-9500' Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: SCT Precip: Temps:
 Ridgeline Wind: Moderate and Gusty from the NW
 Blowing Snow: L Snow Available for Transport: Small amounts
 Comments: Thin, high clouds increased through the day - sky was pretty milky by the afternoon. The wind continues...not much snow left to move, but there was still a bit being transported
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 Head of Beaver Cr Within past week 2.5 HS N N 9600 Observer staying at Wintertux reported this slide happened on 1/23 - probably as a result of the wind event. See photo
 ~3 Upper elev. Within past week 1.5 SS N Several shallow wind slabs
 Comments: Surprised by lack of persistent slab activity in this drainage, especially give the prevalence of steep, rocky start zones.
SNOWPACK OBSERVATIONS
 HS: 70cm at lower elevation flats. 80cm on mid elevation solar. 110-160cm at upper elevations. 
 Upper Pack: Settled recent snow, ski pen ~20cm 
 Middle Pack: Strong midpack, 1f to P. Found a few stout crusts on solar about 40cm down with small facets on top. 
 Lower Pack: 20-40cm 4F FC and DH. Dry on shady, moist near ground on solar 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
11/22 an 12/11, 90-110cm

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: 
 
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:
shallow

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:
Isolated
Terrain
  Problem 2 Comments: Several generations of wind slab, some hard, some soft. None seemed that reactive
STABILITY TESTS
 Stability Test Results: 9400', S: HS=115, PST 35/100end & PST 35/100sf 90cm down on 4F FC. So significant ECT results on mid pack crusts.
9500', N: HS=155, cross slope PST 40/110end
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
BOTTOM LINE
 Comments: Deep slab problem lingers. PST results may be showing signs of improvement and seem less dramatic/consistent. There is a thick, dense slab above the basal facets - especially with a warming trend, you might expect the basal facets to start improving.
FILE ATTACHMENTS

190125_beaver_creek_avy.jpg
Persistent slab near the head of Beaver Creek, released 1/23