Sargents Avalanche Activity

Location Name: 
Sargents
Region: 
Brundage Out of Bounds
Date and time of avalanche (best estimate if unknown): 
Wed, 01/01/2020 - 14:00
Location Map: 
United States
45° 1' 18.534" N, 116° 7' 42.2616" W
US


Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain

Observation made by: Public
Avalanche Observations
Avalanche Type: 
Slab
Trigger type: 
Natural
Crown Height: 
1 ft
Aspect: 
Northwest
Weak Layer: 
Other - explain below
Avalanche Width: 
800ft.
Terrain: 
Below Treeline
Elevation: 
7 700ft.
Bed Surface: 
Old Snow
Avalanche Length: 
300ft.
Number of similar avalanches: 
5-10
More detailed information about the avalanche: 

Quick afternoon trip up to Sargents.  It's nice to finally get a real storm!  Low angle skiing amounted to mostly hip thrusting and wallowing so I did a bit of sightseeing...

1. Details above pertain to the largest avalanche I saw.  It incorporated the majority of the bowl on the north side of Sargents and was well connected.  SS-N-R3-D2-I  The photo shows about half the slide. 

2. Observed many small (D1 -D2) avalanches in steep, micro terrain features. I was able to get onto the bed surface of this slide and found ~ 4mm surface hoar at the new snow/old snow interface.  I can't comment on the local distribution as I didn't take the time to look for it elsewhere.  

3. Additional activity in similar micro terrain features.  Crown height was consistent at: 14-16in and none of these slides stepped down into old snow.  I could see quite a bit of additional activity looking south down the East side of the Bundage Ridge but visibility was too poor for any details. 

4. I experienced consistent, localized collapsing/cracking (3-4ft. from skis) mostly above 7K and a couple more noteworthy collapses once i transitioned into more wind-exposed terrain on the west ridge.  Stomped on a few drifts and a "cornice" on the summit with no results however while climbing back up the NE ridge I had two significant collapses (more energetic) in semi-protected terrain around 7500'.  

May be good to verify in the near future especially as the new snow settles into a more cohesive slab.  

 

 

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
Snow
Wind Direction: 
West
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

Right around freezing when I left the Brundage parking lot around 1200.  S-1 with periods of S1 precip from 1200-1530 (mostly graupel).  Calm winds below 7200'.  Moderate winds with strong gusts in exposed terrain above 7200'.  Winds seemed to shift from SW to NW around 1430.  Moderate wind transport in typical exposed terrain.