Boletín de aludes

Northern Wallowas

Wallowa Avalanche Center
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Peligro de aludes

Sat
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 5 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

The new snow is not bonding well to the old snow surface. Loose dry avalanches can be triggered on steep solar aspects where slick melt-freeze crusts exist. Sensitive wind slabs may be triggered on a variety of aspects near ridgeline and leeward terrain features mid-slope.

Problemas de aludes

  • Wind Slabs

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

    There was enough new snow - 6" in the northern and southern Wallowas and 12" in the western Wallowas - available for transport by the wind onto leeward terrain features near ridgeline. The cold temps have kept this snow light and uncohesive. Light N to W winds have been able to move this snow onto E through S aspects near ridgeline and leeward terrain features in the alpine. Wind slabs will be especially reactive on solar aspects where the new snow has not bonded to slick melt-freeze crusts. Carefully evaluate any slope > 30 degrees for instability. Pay particular attention for areas where the new snow is sitting on slick crusts and avoid wind-drifted leeward terrain features denoted by smooth pillows below ridgeline and mid-slope. When in doubt, mellow it out. Stay off of steep slopes.

  • Loose Dry

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

    The 6-12" of new snow is not bonding well to slick crusts on solar aspects where slope angles approach 35 degrees or more.  The problem with loose dry avalanches, or sluffs, is on steep icy slopes the debris can accelerate quickly and carry you into trees, rocks, or over cliffs.  Avoid steep slopes where 6" or more of new snow is sitting on melt-freeze crusts from last week's warm up.

Avalanche Discussion

The Wallowas received significant amounts of snow early in the week. Most locations above 6,000' received 6" or more. The western Wallowas easily got over 12" of new. This new snow is not bonding well to the old variable snow surfaces that range from stout melt-freeze crusts on solar aspects to weak uncohesive snow on more northerly slopes. It is time to be very dilegent in your snowpack assessment. There is alot of variability in snowpack structure and instablity across aspects. Do your homework before dropping in or on any slope greater than 30 degrees. If you are uncertain about the hazard - move to lower angle terrain. Remember...ski and ride one at a time. Avoid trigger points like convex rolls, rocky terrain, and wind-drifted areas below ridgeline. Choose slopes that are concave and don't funnel you into trees or into a terrain trap like a gully. Now is the time to dail it back and be cautious.

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