Bollettino valanghe

East Slopes Central

Northwest Avalanche Center
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Pericolo valanghe

Mon
Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

UPDATE: 7:15a Watch for triggering small avalanches where surface snow is poorly bonded to older layers and where the wind forms drifts above treeline. Any avalanches on Sunday will be small and shallow (5-10"), but they could run a long way down the slope. Expect enough southeast wind to drift snow on Saturday night and a dusting of another 1-2" of snow by the end of Sunday.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1

    Watch for triggering fresh wind slab avalanches on leeward sides of ridges and wind-exposed features.  Steer around features that look pillowed, drifted, or deeper than other slopes. Blowing snow, cracking, and stiff, cohesive snow are all indicators that you may be able to trigger a slide. The fresh slabs should be limited in width and distribution. I expect them to exist just at the top of start zones and to not extend into lower terrain.  Be prepared to make your own observations to determine if you can trigger these avalanches and where the slabs lie in the terrain.

    Southeast winds will be strongest on Saturday night but they may still gust enough to intermittently transport snow through Sunday. There may only be an additional 2" inches of snow by Sunday evening. In areas like the Salmon la Sac, Teanaway, and east side of the Chiwuakum Mountains there may be enough recent snow to form isolated slabs. These may be reactive, as they may not bond very well with a refrozen crust underneath.

    (12/12/2020) Blowing snow captured in the foreground on the summit of Rock Mountain. Looking south towards the south peak. Will Govus photo

Avalanche Discussion

If you find 4" or more of recent snow over last week's crust, be aware of sluffing. Recent observations from nearby zones found small loose dry avalanches to run easily on steep slopes. Up to 4" of low-density snow fell Thursday night into Friday with minimal wind. This sits on an icy and refrozen crust from December 9th. Take note what you find above this crust as we head into the next storm cycle. By Sunday morning, there will be fresh snow on the ground, and avalanche danger increases.

Conditions may be icy, and difficult to travel through with a breakable crust in some places. Expect shallow snow cover at low elevations and bare ground particularly on low south-facing slopes. Typical early season hazards can be expected with open creeks, stumps and rocks. 

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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