Boletín de aludes

Tetons

Bridger-Teton Avalanche Center
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Peligro de aludes

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

Lo esencial

Very dangerous avalanche conditions exist today. Triggering an avalanche large enough to bury, injure, or kill a person is likely in avalanche terrain at all elevations. In addition, destructive natural avalanches are of concern in the upper elevations. Traveling in, near, or under avalanche terrain is not recommended today.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    1–3

    Large, deadly avalanches failing on very weak snow formed in December are a real threat today. In the middle and upper elevations, avalanches will break 3 to 5 feet deep. Below 7,500’ slab depths will be in the 1 to 3 foot range. All aspects (shaded and sunny) at all elevations are suspect. Only the lowest elevation slopes that were bare ground prior to January 4th have escaped this problem. Slabs could be triggered from a distance, or wait until you have committed to the slope to release. Approximately 4-6 inches of new snow fell overnight in the upper elevations of the Tetons. This additional load, while small, will only further stress a snowpack that is on the brink. Extremely careful route finding is of the utmost importance today. Keeping slope angles below 30° and staying well away from terrain that is connected to avalanche paths is critical. This also means being aware of the terrain above you as remote triggering is possible.

    We have recieved many avalanche observations over the past few days. Thank you! Please take a moment to look at the recent events here.

    (1/13/2024)

    Wide proagation on Devil's Slide near Teton Pass.

  • Deep Persistent Slabs

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

    Weak snow formed during a dry period in November persists at the base of the snowpack. This layer is now buried about 5 to 6 feet deep in the Tetons and is weakest on the north half of the compass. The recent loading event has pushed this weak layer to its breaking point in some locations. Deep slab events have been reported at Grand Targhee and in Grand Teton National Park over the past few days. These very large avalanches are most likely to occur when an avalanche triggered in the most recent snow steps down to weak November snow. Any avalanche involving the entire snowpack will be destructive and likely unsurvivable.

    (1/13/2024)

    A very large (D3) avalanche in the Static/Albright cirque. Note the areas in the apron that stepped down to older snow.

Avalanche Discussion

There are no two ways about it. Avalanche conditions are dangerous right now. A historically weak snowpack has been overloaded by nearly 4 feet of snow containing 4 inches of snow water equivalent (SWE). We are one day out from widespread natural avalanche activity, some of which produced very large and destructive (D3) avalanches. As of this morning, 17 human triggered avalanches have been reported in the Tetons since January 4th. At least 4 people have been caught and carried by avalanches. The widespread and well developed nature of the December weak layer means that avalanches have the potential to propagate long distances, and break well into adjacent low angle terrain. This large avalanche that occurred yesterday on Teton Pass illustrates the well connected avalanche problem that we are currently dealing with. Expect these avalanches to behave differently than what you have seen in the past. Today is a day to step back, let the snowpack adjust, and make very conservative terrain choices.

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