Sargents Natural

Location Name: 
Sargents
Region: 
Brundage Out of Bounds
Date and time of avalanche (best estimate if unknown): 
Tue, 01/28/2020 - 14:00


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
40degrees
Trigger type: 
Natural
Crown Height: 
1 ft
Aspect: 
West
Weak Layer: 
Storm Snow
Avalanche Width: 
50ft.
Terrain: 
Near Treeline
Elevation: 
7 700ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
200ft.
More detailed information about the avalanche: 

Natural that likely occurred during high PI yesterday afternoon, about 4” of new snow on the debris (soft).  It looks like it started as a shallow storm snow release above the cliffs and stepped down. Note debris stopped on a flat bench but some ran up a terrain feature at the end the flat bench would have likely ran further if not stopped by the bench.  I think this instability settled out overnight, we had no red flags today and skied some slopes over 35 degrees.  Note: After seeing this we all agreed that a bit of caution was warranted and did avoid some of the steeper areas I would typically ski in this area.

Some quick pole columns and hand ECTs all showed a break/shear within the new snow that did propagate in the ECTP 10-15 range at 5-6” depth, this may correspond to the initial upper fracture.  This looks to be a minor concern and will likely settle out.

Overall a moderate hazard with some pockets of considerable in wind affected terrain, some of these pockets may be hard to ID due to the final pulse of the storm falling with very little wind.

2nd photo – Surface hoar on all aspects, hopefully not the next weak layer.

 

Avalanche Photos: 
Weather Observations
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Calm
Precipitation: 
Air temperature trend: 
Warming
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Some thin clouds were building by my exit at 11.30.