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PROFESSIONAL OBSERVATION FORM
 Start Date: 01.12.18 Name: Wieland Operation: SAC
 Drainage/Route:  Spring/Cherry Observed Terrain:  7-10k Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 20-30cm HST: 20-30cm Sky: OVC Precip: Temps:
 Ridgeline Wind: Light and Intermittent from the W
 Blowing Snow: Prev Snow Available for Transport: Large amounts
 Comments: Intermittent patches of blue sky/sunshine during tour but generally overcast with some low clouds sweeping through midday.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 Several Saviers 10000 D1-D2.5's which appear to have run mid storm.
 Several Mill Ck 9200 D1-D2's which appear to have run mid storm.
 Several Prairie Ck/W. Fork Prairie Ck 9400 Several fresher slides that ran at end or right after storm. Some others that ran mid-storm also.
 Comments: Many avalanches appeared to have run mid-storm. Poor light did not allow for the best avy obs. Most avalanches observed ran at upper elevations. A few ran to valley bottom.
SNOWPACK OBSERVATIONS
 HS: 120cm on SW @ 9600' 
 Upper Pack: 35cm over 1/5? 
 Middle Pack: FC over 12/19 not as weak as other areas i've observed. 
 Lower Pack:  
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: Persistent/Storm slab problem. Didn't cover all aspects but with naturals activity and pit results this problem is obviously rearing it's head on 2 crusts. Would call sensitivity reactive to touchy. Recent storm snow was sitting on very weak facets above old crust in shallow areas in trees below 8000 on SW.
 
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:

Terrain
  Problem 2 Comments: Just barely got into upper elevations but generally found little to no wind slabs near ridge. Small cornice growth with easy breaking on stomps. Small pillow released under cornice naturally, less than D1, but nothing breaking with some larger cornice chunks. Isolated dunes were unreactive to ski cuts. Likely a bit more of a problem/more reactive higher up but it appeared this area of the Boulders did not have a very widespread wind slab problem.
STABILITY TESTS
 Stability Test Results: ECTP's in the 13-16 range failing on FC above 12/19 or 1/5? which are down 55cm and 35cm. Seemed to alternate failure layer on each test.
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Collapsing (widespread)    
 Comments: Most areas where any old snow was found collapsed during ascent.
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
 Comments (aspects and elevations of instability, etc): Smokys looked much more active and HIGH rating was appropriate for that area.
BOTTOM LINE
 Comments: Warm on ascent. Surface warming on most aspect up to 8000. Confined to SW/S/SE above that and will likely have crust by tomorrow. Many avalanches but did not see anything D3 size although very difficult light today. Still avoided all avalanche terrain. Some rollerballs observed near rocks on solars in southern Boulders near end of day but Reports of greater HST amounts in Baker Ck area than what I observed with several human triggered avalanches and one remote trigger from 1000 ft away in Brodie.
FILE ATTACHMENTS

WForkPrairie.jpg

SouthofEasley.jpg

PrairieCkdebris.jpg
Some smaller pockets below cliff stepped down.