Boletín de aludes

Tetons

Bridger-Teton Avalanche Center
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Peligro de aludes

Sun
Alta montaña
3 · Notable
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

Triggering newly formed wind slabs 1-3 feet deep will be likely in steep terrain in the upper elevations today. Moderate to strong winds will continue to build slabs and allow for the possibility of natural activity. In the lower elevations avalanches are unlikely except in isolated pockets of very steep terrain.

 

Problemas de aludes

  • Wind Slabs

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

    New snow (6-10”) and strong winds formed slabs in the last 24 hours that will be sensitive to the weight of a person today. It will be more likely to trigger these slabs in terrain over 35 degrees in steepness and where the wind has deposited the new snow. Given the high wind speeds, expect slabs to have formed further down and across slope than normal. Slab depths will vary greatly due to the high winds and be in the 1-3 foot range. Watch for signs of unstable snow such as recent avalanches, shooting cracks and whoompfing. The best way to address this problem is to keep terrain choices simple by avoiding wind loaded slopes today.

    (2/7/2025)

    D1.5 windslab NE 8200’ on Whimpy's in Grand Teton National Park

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1.5–2.5

    Snow that fell over the first 3 days of February built slabs 2-4 feet thick. These slabs sit on a variety of interfaces, including crusts on solar aspects and facets on shaded aspects. The likelihood of triggering slabs at this interface is becoming less likely over time. The possibility remains to activate this layer, particularly in very steep terrain or in cases where an avalanche involving the recent snow increases the stress on these deeper layers in the middle of the snowpack.

    (2/3/2025)

    A large skier-triggered avalanche on a NE-facing slope at 9,400' south of JHMR. It likely failed within the new snow on a density break and was thickened by wind loading. 7 skiers were caught and carried. All members of the party survived the incident.

Avalanche Discussion

Avalanches within the new snow are the most likely problem to encounter today. Activity likely peaked during the day yesterday in step with the combination of intense precipitation and high winds. Numerous observations indicated this instability throughout the Tetons. Expect the snow to be less reactive than yesterday, but still unstable in steep wind loaded terrain.

The Jan 31 interface consisting of crusts and facets remains on the radar. This layer was buried by 3-4 feet of snow containing 4” of Snow water equivalent. Since that layer was buried 5 days ago, temperatures have been warm, rain has fallen up to 9,000 feet, new snow and wind has stressed the snowpack, and temperatures have now cooled back down. In summary, the snowpack has been put to the test by the weather. While observations have been somewhat limited, the lack of reported activity at these depths, combined with these weather factors paint a picture of improving stability at this interface.

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