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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.25.19 Name: Savage, VandenBos Operation: SAC
 Drainage/Route:  driving Ketchum-Stanley and back, Galena Summit tour Observed Terrain:  5800-9000', many aspects Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 25cm? HST: 40cm? Sky: X Precip: S3 Temps: 25-32F
 Ridgeline Wind: Moderate and Gusty from the SE
 Blowing Snow: M Snow Available for Transport: Large amounts
 Comments: Winds=moderate at valley floor from the SE in Salmon River drainage (Stanley side of the pass), light at Galena Summit down to Prairie Creek, then light/moderate Prairie Ck-Eagle Creek at the valley floor. Temps around freezing in Ketchum and in Stanley, 20s F near Galena Summit.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 2 Sunny Gulch/Gold Ck Today 1.5 SS N W 7300 Cross loaded wind slabs in Stanley area.
 2 Galena Summit Today 1.5 SS N S 8400 One small slide near Galena Lodge, one about 100' wide just below Alexan der Ross pullout.
SNOWPACK OBSERVATIONS
 HS: not observed 
 Upper Pack: PP: surface getting moist near Ketchum and Stanley, otherwise no obvious mid-storm weaknesses...then 2/23 old snow/new snow interface (FC on many slopes)...then RG/DF  
 Middle Pack: not observed 
 Lower Pack: not boserved 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Storm Slab

Layer/Depth:
20-30cm

Likelihood of Triggering
Sensitivity:
Reactive

Spatial Distribution:
Specific
Terrain
  Primary Concern Comments: This was a problem on very steep slopes near the valley floor around Kethcum and Stanley. Also a more isolated problem around Galena Summit.
 
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:
20-40cm

Likelihood of Triggering
Sensitivity:
Reactive

Spatial Distribution:

Terrain
  Problem 2 Comments: Observed natural activity along HWY 75 south of Stanley.
STABILITY TESTS
 Stability Test Results: None performed.
SNOW STABILITY
 Snow Stability Rating for your observed area: Poor Confidence: MODERATE Trend: Worsening
BOTTOM LINE
 Comments: Storm slabs becoming touchy on old/new interface as snowfall accumulated. Not huge slides, but getting wider and more sensitive as the day went on. Problem seemed to be most apparent near valley floors from our observations, and slopes had to be approaching 40* for activity. Hard to tell how much new snow exists in various locations due to the total snow depth settling as fast as the new snow piles up. With copious amounts of new snow and moderate to strong ridgetop winds, it's a safe bet we have a serious wind slab problem at upper elevations, and it will only get worse over the next couple days.