Boletín de aludes

Snake River Range

Bridger-Teton Avalanche Center
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Peligro de aludes

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

Lo esencial

It will be possible to trigger avalanches that are 1-3 feet deep. Steep, shaded terrain at the middle and upper elevations is the most likely place to produce a large avalanche. Be on the lookout for pockets of wind-drifted snow in exposed terrain. Carefully evaluate the snowpack structure before committing to a slope. 

Problemas de aludes

  • Wind Slabs

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

    Southerly winds redistributed recent snow and built slabs 1-2 feet thick on lee slopes and in crossloaded terrain at upper elevations. The Baird wind station reported consistent SSE winds yesterday afternoon through the evening in the 20s gusting to 30s mph. Watch for signs of wind-loading, including blowing snow, dense drifts, and smooth or rippled textures. Cracking is a good indication that you have found unstable snow. Soft slabs involving recent snow will be the easiest to find, but it is possible that a surface slab could step down to deeper weak layers in the snowpack, resulting in a larger avalanche.

  • Persistent Slabs

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

    Slabs of cohesive snow 1-3 feet thick overlay weak, faceted snow above 7,500’. The potential to trigger an avalanche at this interface is most likely on slopes on the northern half of the compass above 8,500’.  On sunny slopes, the distribution of weak snow (crusts and facets) under the slab is patchy, but avalanches remain possible.  Collapsing the weak layer in steep, rocky, or unsupported terrain is the best way to trigger one of these avalanches. Remember that a slope can be ridden several times before a particular spot is impacted. South-facing slopes that were bare ground before Dec 15th hold a generally more stable snowpack. Dig down to assess the snowpack and locate weak, sugary snow.

    If you are uncertain about the structure of the snowpack where you are skiing or riding, the best way to avoid triggering an avalanche is to seek out low-angle terrain.

    (12/21/2024)

    A large natural hard slab avalanche in the Snake that occured somtime around 12/18.

Avalanche Discussion

It looks like Santa is a day late with the next storm - that's OK, he's been working overtime recently, and I can wait one more day for powder. While warm temperatures have helped increase the strength of the snowpack, the poor structure still exists in many locations.  Investigate the snowpack while you are out today, and let us know what you find. This will help paint a picture of the location of weak snow. The next storm is on our doorstep and will add a significant load to the snowpack. Continue to travel one at a time through avalanche terrain and consider the consequences of getting caught. While the riding has improved above 8000 feet, remember that it is still a thin snowpack at lower elevations when you exit the mountains. Watch for shallow coverage, rocks, and logs on your way back to the plum pudding.

Merry Christmas!

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