Boletín de aludes

Elkhorns

Wallowa Avalanche Center
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Peligro de aludes

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

Lo esencial

Heavy rains and warming will likely trigger many natural avalanches today throughout the mountains on slopes greater than 30 degrees.  If there is a rapid change event to trigger a deadly 2-4' thick slab involving our January weak snow, this is it.  This is a good day for indoor activities, but if you do travel outside, do not stop yourself or your vehicle under steep roadcuts or snowy roofs.  We recommend avoiding avalanche terrain.  

This forecast is sponsored by M. CROW – M. Crow

Problemas de aludes

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    1–2.5

    Rain on snow will cause widespread avalanching.  Expect to see this on roadcuts and some lower elevation terrain that may not slide often.

    Wet loose avalanches typically start in terrain steeper than 35 degrees, and while they travel slowly, they are very dense/destructive and can travel long distances into the flats.   

    With this volume of rain, Wet Slab avalanches are possible if liquid water percolates down to a crust or bed surface.  

    (1/12/2025)

    An example of an avalanche runout zone in the Northern Wallowas 

    Photo: Steve D

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3

    A rapid input/change of rain and warming will increase the likelihood of a very large and deadly persistent slab awakening.  This weak layer has been slowly gaining strength, but an additional load on the slab above it will test it.  If it's going to slide, it would be today.  

    This picture was submitted Thursday of a reported natural avalanche that was taken along the Anthony Lakes Highway at about 5600'.  It was reported to have failed on January Facets with minor loading/input.  

    (2/20/2025)

    This natural avalanche was reported along the Anthony Lakes Highway at an elevation below 6,000.  It was reported to have failed on the January facets.  Photo: Logan Kerns

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    If for some reason you brave the high snow line and venture into the alpine, look for textured, rippled or unusually smooth surfaces.  Feel for hollow or drum-like sounds, or snow that suddenly supports your skis, board or machine.  Avoid these features in avalanche terrain.   But take photos!

    (2/20/2025) Photo: Caleb Merrill

     

Avalanche Discussion

Another 1" of rain up to 8000' will create dangerous avalanche conditions on all terrain greater than 30 degrees.  Some of these slab avalanches could be 2-4' thick and unsurvivable. 

If you do brave the sogginess, avoid all areas where avalanches can start, run, or stop. This includes openings in the forest well below large steep alpine slopes.

It's been great to see all of the recent observations.  Thanks to a member of the public who submitted a roadside natural slab on the Anthony Lakes highway last week.   Road or spotting scope photos are excellent.  Add value to your forecast.  Submit an observation here.  

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