Boletín de aludes

Togwotee Pass

Bridger-Teton Avalanche Center
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Peligro de aludes

Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
Sin grado
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Desactualizado: este boletín caducó last year. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Watch for isolated pockets of wind-affected snow in exposed terrain. Steer clear of steep slopes where you find wind-drifted, pillowed snow or areas below cornices. The possibility also remains of triggering a large avalanche on weaker snow buried in the snowpack—be prepared to scale back your terrain choices. 

Problemas de aludes

  • Persistent Slabs

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

    Slabs overlying weak layers buried 2-3 feet deep remain possible to trigger on very steep slopes over 35°. Signs of instability such as cracking, collapsing, or recent avalanches may not be present before triggering a large, dangerous avalanche capable of propagating far across or upslope. Multiple tracks on a slope do not indicate that a slope is stable. Stick to lower consequence terrain away from terrain traps and rocky, convex, very steep slopes today.

    ADDITIONAL DISCUSSION

    While Togwotee has not received much snowfall in the recent storm, watch for small, isolated pockets of wind-drifted snow. Per usual caution, steer clear of pillows, dunes of new snow, and cornices.

    (2/19/2025)

    This terrain is very steep and cliffy and has produced multiple avalanches in the past 10 days. This is a prime example of a slope harboring persistent weak snow. 

    Photo: Bridger-Teton Avalanche Center

  • Deep Persistent Slabs

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

    Weak snow buried 5 feet deep exists near the ground above 9,000’. Triggering an avalanche at this depth is very unlikely but not impossible.

    On February 10th, a rider stepped off their sled and triggered a very large avalanche that failed near the ground on Lava Mountain. This avalanche was triggered where the overlying slab was thin making it possible for the rider to impact the underlying weak layer. Manage this problem the same way you would manage weak layers in the middle of the snowpack by avoiding very steep, rocky, and wind loaded terrain.

     

    (2/11/2025)

    The crown of the recent unintentionally-triggered avalanche on the E face of Lava ~10,400'.

    Photo: Bridger-Teton Avalanche Center

Avalanche Discussion

 Active weather will continue today with an additional 2-4 inches of snowfall and strong westerly winds. Slopes with winded snow should remain on your radar, in addition to the larger, deeper problems that linger. The likelihood of triggering a larger avalanche increases as the slope angles increase and when significant triggers (groups, multiple snowmobiles, cornices) hit thin spots in the slab. Thin spots exist on the boundaries of terrain that have been impacted by the wind and are more problematic when the snowpack connects to thicker slabs within that same terrain. In periods of improving stability, it remains important to follow safe travel practices despite a lack of general avalanche activity. Travel one at a time in steep terrain, avoid stopping in the runout of avalanche paths, and communicate with your partners throughout the day. Today, it will also be possible to encounter recent snowfall sluffing from steep terrain and wind slabs ~1 foot in depth in exposed terrain. 

This past month has slowly increased the snow depth across the board, and time has helped weaker snow adjust to the weight of the slab on top of it. There's been plenty of good riding to be had. After the initial effects of this storm,  surface instabilities within the new snowfall will likely taper off quickly until the skies clear. Expect conditions to become more sensitive with warm temperatures and sunny skies on the horizon.    

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