Boletín de aludes

Tetons

Bridger-Teton Avalanche Center
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Peligro de aludes

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

Lo esencial

Dangerous avalanche conditions exist on very steep slopes that face the sun. Natural avalanches are possible, and human-triggered wet snow avalanches are likely. Some avalanches could become large enough to bury or injure you. Avoid traveling on or under very steep and sunny terrain as the day heats up. Exit the mountains or move to lower-angle slopes if you encounter wet snow. Give cornices plenty of room.

Several bear sightings have been reported this spring. When planning for the day, bear spray, group travel, and appropriate food storage should be considered.

Problemas de aludes

  • Wet Slabs

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

    A mixture of dry snow with facets and crusts remains in the top portion of the snowpack on many middle and upper-elevation aspects. These avalanches will not be widespread but are most likely at middle and upper elevations, where meltwater reaches these weak snow/crust sandwiches. This recipe is most prominent above 8000' on slopes facing E-NE-N-NW. Very warm temperatures and sunshine pushed meltwater deep into the snowpack. Last night's temperatures remained above freezing, allowing meltwater production to continue. The potential for large wet slab avalanches will remain until the snowpack fully drains or refreezes.

    This problem is hard to predict and not easily managed. Your best bet is to avoid traveling in large start zones that have wet snow or avoid terrain around rocky outcrops that may cause additional heating and water movement. 

     

    (3/25/2025)

    A large natural wind slab yesterday that was most likely cornice-triggered.

    Old wind slabs will have increased sensitivity during peak warming, increasing the likelihood of natural and human triggering.

  • Loose Wet

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

    Above-freezing temperatures last night combined with sunny skies this morning will make natural avalanches possible and human-triggered wet avalanches likely on very steep slopes. The potential exists for wet slab avalanche activity below 8500’ that could fail on the 3/13 crust buried up to 14” deep. Look for slushy, unconsolidated snow as you travel. If you step out of your skis and sink to your boot top, enact your exit strategy. Most avalanches will be small, but wet slides can easily entrain more snow than you expect, and some may grow large enough to injure or bury you. Minimize time spent under large, steep slopes that face the sun.

    Cornices are sensitive right now with current warm temperatures and a lack of overnight freezing. Minimize time spent on slopes with large cornices looming overhead. They can break unexpectedly and act as very large triggers.

    (3/8/2025)

    Loose snow avalanches similar to these will become likely on steep, rocky, and sunny slopes as the day warms.

    Photo: Bridger-Teton Avalanche Center

Avalanche Discussion

The snowpack does not like rapid changes, like long periods of above-freezing temperatures. The typical early alpine start used to mitigate the hazard of warming temperatures and softening surfaces is not necessarily effective when there is no overnight freeze. Monitor snow surfaces for increasing moisture. If you step out of your skis and sink to your boot top in wet snow, move to lower-angle slopes.

Wet avalanches are hard to predict. Conservative terrain selection is a good solution to this problem.

Also, please remember that closed ski areas are now uncontrolled and could have the same avalanche problems as the backcountry. Warm temperatures and sunshine can create the same wet problems even on previously groomed and heavily compacted slopes. Keep this in mind if skinning up or skiing on very steep ski area runs.

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