Bollettino valanghe

East Slopes North

Northwest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Shifting winds will easily transport new snow on Wednesday, potentially cross-loading slopes or building shallow new winds on different aspects.  Avoid steep open slopes below ridgelines and use caution in all terrain where you find wind-affected snow.  Fresh cornices have grown larger - carefully consider the overhead hazard as you move through terrain. 

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    The most recent storm cycle delivered more wind than snow.   While westerly winds have been the primary driver snow over the last few days, a switch to N and eventually E winds may start to drift snow onto different aspects on Wednesday. 

    You should expect a higher likelihood that you'll encounter and trigger a wind slab avalanche with increasing elevation. Avoid large steep open lee slopes below ridgelines and cliff bands.  If you're traveling along ridgelines, give fresh cornices a large berth as they can easily break back further than you expect.  While unlikely, natural cornice fall can trigger an avalanche on the slopes below so be aware of your overhead hazard as you move about.  Larger and more consequential avalanches are more likely near the Cascade crest where more new and recent snow is available for transport.  Use caution in any elevation band or aspect you find firmer, wind affected snow.  

    On very steep slopes and in wind-sheltered terrain, dry loose avalanches are possible.  Don't let a fast-running sluff knock you off your feet near a terrain trap.  

    (1/6/2023) Blowing snow coming off Blue Lake Col. 

    Freshly built cornices will tell you which slopes have been loaded over the last few days by westerly winds. 

Avalanche Discussion

Avalanche Fatality: Colchuck Pk, East Central Zone: Read the preliminary report here.

Forecast Discussion:

Over the last few days, observers have reported about 10-16" of snow over the 2/12 crust near Washington Pass (the crust is present up to about ~7000') with less new snow for areas further east. On Tuesday, avalanche professionals in the Washington Pass area reported some ridgelines stripped of the recent snow and cracking on lower angled and wind affected slopes.  On Monday, a large natural slab avalanche released below Blue Lake.  Blowing snow was observed near and above treeline and fresh cornices were growing along ridgelines.  This was a continuation of a trend that started Sunday, where shallow wind slabs (4-10") were developing and becoming increasingly sensitive as the day wore on.    Prior to the current storm cycle, avalanche activity had been relatively limited dating back to the last avalanche cycle in this area between Feb 3-8th. 

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