natural on Sargents

Location Name: 
Sargents
Region: 
Brundage Out of Bounds
Date and time of avalanche (best estimate if unknown): 
Sat, 12/01/2018 - 01:00


Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
39degrees
Trigger type: 
Natural
Crown Height: 
2 ft
Aspect: 
Northwest
Weak Layer: 
Old Snow
Avalanche Width: 
100ft.
Terrain: 
Near Treeline
Elevation: 
7 650ft.
Bed Surface: 
Other - explain below
Avalanche Length: 
75ft.
More detailed information about the avalanche: 

Likely ran during Dec. 1 storm event, 4" snow on bed surface.  Bed surface is crust.  Might have stepped down below crust in places.  There were no partially filled tracks nearby so I assume natural.  Just to the skier’s right and below of the low angle ridge run, it would be easy to ski into a pocket like this.  Crown is about 18”.

ECTP above crust Q1.5 popped well but lacked enough energy to call it Q1.  Weakness was 2-3mm facets.  Similar facets below crust. 

I’ve been concerned about these facets and assumed that at some point I would see something like this.  Overall this far after the storm it might be hard to trigger due to a lack of energy in the slab.  However over the last 2 days there have been plenty of collapsing and whumphing.

Hard call on the hazard, likely in the moderate range, but I am traveling as per considerable hazard and avoiding steep terrain on the north ½ of the compass. 

The facets will likely reactivate and require time to adjust after additional loading this week.

Of note are also surface facets and a weak upper snowpack due to this week’s cold weather, this is the next red flag…

Snowpit or crown profile photo or graph: 
Looking South
Looking North
ECTP 17 Q1.5
Weather Observations
Air temperature: 
Precipitation: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: