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Payette Avalanche Center

Public Observation

Observation Details

Observation Date:
December 17, 2020
Submitted:
December 17, 2020
Zone or Region:
Brundage Out of Bounds
Activity:
Skiing/Snowboarding
Location:
Sargents

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Isolated
Did you experience collapsing or whumpfing? 
Yes, Isolated

Observations

The other two photos are from the approach road below the meadow at about 6600', I was able to step off the skin track and get a good collapse and a 40’ shooting crack in the storm slab which was sitting on facets. I tried to isolate a quick ECT in this area and it failed on isolation. This area has a bunch of good little mid elevation test slopes right along the road.

I also tried ski cutting a steep northwest -facing rollover with no results.

The lack of in your face red flags such as cracking and collapsing on the east side has the potential to lure folks into tricky situations.

Exposed Southerly aspects were scoured and only had a minimal amount of storm snow.

There was a thin zipper crust on all aspects. I'm thinking perhaps a quick flash of rain?

Based on what I saw on the approach road, we were traveling as per considerable hazard protocols.

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Media

Shooting Crack along approach road.
Quick ECT failed upon isolation along approach road.
Snow pit on East, Northeast aspect, 7600', Basal facets were damp. upper facets dry.
ECTP11, Q1+

Advanced Observations

Observed Avalanche Problem #1: 
Storm Slab
Comments: 
Storm snow (HST-8-10”, dammit, Hunter Mountain got more snow than we did today!) is sitting over facets. As shown in the pit photo below, 4-finger storm snow is overlying a thick layer of fist hard facets. Not a good combination! Also made for punchy trail breaking. The pit was on an east aspect with a bit of north at about 7600’. One ECT- ECTP11, it popped with some good energy at the base of the new snow, Q1+. While breaking back to the ridge, we had no cracking or collapsing n this area which was surprising.

This dense storm slab over weaker snow should be considered a red flag.
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