Boletín de aludes

West Slopes Central

Northwest Avalanche Center
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Peligro de aludes

Mon
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 4 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Avalanche danger will slowly increase as snow falls during the day Sunday. You may find thicker wind drifted pockets of snow at mid to upper elevations, which could slide with a human trigger. Heavy snowfall begins Sunday night and avalanche danger will increase as the storm continues. 

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    Saturday we're forecasted to get 3-6 inches of snow during the day. This will sit on top of a similar amount that fell the previous night, and is overlying a crust. Wind may drift the snow, old and new, into 1-2 foot slabs at near and above treeline elevations. You're most likely to find slabs around rocky outcroppings, in gullies and on leeward sides of features. You could trigger avalanches in these deposits on steep slopes.  Some of the slabs may be unreactive, however, if you encounter any obvious signs of instability such as cracking, there's a good chance the slab could slide if it's steep enough. As you travel, pay attention to quick transitions from shallow snow layers to thicker drifts.  Any thicker areas could use an evaluation on your part, to determine whether the snow stubbornly sticks in place, or if it cracks or slides easily within the new snow layers or on the underlying crust. If you don't feel comfortable with assessing this, avoid slopes greater than 35 degrees where you notice these thicker drifts are present. 

    (3/18/2022)

    Pay attention to shooting cracks occurring around you on thicker snow deposits. If you encounter these, snow could slide on a steep slope. 

    Photo: Lee Lazzara

Avalanche Discussion

A deep persistent slab avalanche concern previously listed as a problem is remaining on our radar. We don't expect that a human could trigger an avalanche on the layer, located on upper elevation northerly aspects.  There's a chance that a large cornice falling on it, or another avalanche, could trigger this layer buried 4-8 feet down, which would result in a very large avalanche.  For now, remain aware of the problem, and consider not lingering for long periods on or beneath large slopes where it may exist, especially if large overhead cornices are present. 

Sunday starts a period of unsettled weather which will continue through Tuesday. Large amounts of snow will fall Sunday night, and avalanche danger will rapidly rise. If you're planning on getting into the backcountry in the next few days, make sure to take the abrupt weather change into account. 

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