11th Annual Utah Snow & Avalanche Workshop Open and Motorized Sessions Oct. 27th.
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Observation Date: 
1/28/2018
Observer Name: 
S. Zimmerman-Wall, T. Matthews, W. Deutschlander
Region: 
Uintas
Location Name or Route: 
Upper Weber Canyon
Weather
Sky: 
Broken
Wind Direction: 
Southwest
Wind Speed: 
Light
Weather Comments: 
Low ceiling, warm, and humid to start the morning. Temps increasing and skies trending towards partly cloudy by noon. Light winds, cool in the shade. Atypical Uinta weather.
Snow Characteristics
Snow Surface Conditions: 
Powder
Wind Crust
Rain-Rime Crust
Snow Characteristics Comments: 
Riming on most aspects near tree line. Variable surface conditions, but generally soft and mostly skiable. Snow profiles continue to reveal poor structure (mid pack facets) on NW-N-NE-E facing slopes NTL/ATL. Sudden results in snowpack tests. Audible collapses across North and East aspects. CTM SC failing on buried SH down 39 ECTPM SC x 2 failing on buried SH down 39
Red Flags
Red Flags: 
Recent Avalanches
Wind Loading
Collapsing
Poor Snowpack Structure
Avalanche Problem #1
Type: 
Persistent Weak Layer
Trend: 
Same
Problem #1 Comments: 
With winds dying down in our location, this issue was of most concern. Naturally occurring avalanches in the Giant Steps area (ATL bowl NE through S facing) since Friday were driven by overloading by wind, but the size, connectivity, and debris point to persistent slab. Mid pack facets are 2mm in size and a buried SH layer on isolated northerly terrain features are possible weaknesses. Even a seemingly small slab could get out of hand quickly as it steps down into these weaknesses.
Avalanche Problem #2
Type: 
Wet Snow
Trend: 
Increasing Danger
Problem #2 Comments: 
With warming today and into the week, expect this issue to rise on steep slopes that receive solar input (ESE through WSW).
Comments: 
1. Snow profile @9600 NE facing terrain. Notice thin grey stripe of buried Surface Hoar in upper pack; mid pack facets (Photo: Matthews) 2. Buried SH down 39cm. (Photo: Matthews) 3. Buried SH down 39cm. (Photo: Matthews) 4. Giant Steps avalanches x 3. Did not see looker's left slide in the photo on the bulletin morning of 1/28. Looks to have happened overnight and may have been attributed to cornice fall. (Photo:Zimmerman-Wall) 5. Giant Steps (Photo:Zimmerman-Wall)
Today's Observed Danger Rating: 
Considerable
Tomorrows Estimated Danger Rating: 
Moderate
Snow Profile Coordinates: 
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