Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 5 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Cold temperatures and lighter wind speeds today, will lessen the chance of encountering a wind slab avalanche. The primary concern lies at the mid and upper elevations, where the weight of a single person could trigger a large destructive avalanche on buried weak layers 3 to 5 feet below the surface and possibly deeper on wind-loaded features. Due to the thickness of these slabs, backcountry travelers will probably not encounter any warning signs prior to the release of the avalanche. Increased snow depths and clear skies will cause people to travel into terrain that may not have seen traffic this season. Careful evaluation of the snowpack is essential to determine the presence of this avalanche problem. In the low elevations, avalanches are unlikely except in very steep isolated pockets.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3

    The consequences of being caught in an avalanche involving the Dec 5th interface are severe. This week there have been several avalanches reported on this layer. Most of these slides occurred on avalanche-prone terrain above 8,500 feet on the north to east facing slopes and the failure has been on faceted snow over a stout crust. Backcountry travelers should use caution, good snowpack evaluation, and allow the snowpack time to adjust to last week’s significant loading event.

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely
    Größe
    1–2

    There remains a chance for backcountry travelers to trigger wind slab avalanches 1 to 3 feet in depth on wind loaded slopes along high ridges. These slides could then trigger more destructive avalanches on the deeply buried weak layers.

Avalanche Discussion

A ridge of high pressure will keep conditions dry and cold. Overnight temperatures will drop below zero and then warm into the teens. Westerly winds will be 10 to 20 mph on ridges in the mountains. Avalanche conditions continue to be dangerous. Above 8,500 feet, the weight of a single person could trigger high consequence slab avalanches with depths to five feet. This avalanche problem may not present with warning signs, and a slope could be skied many times before the thin spot on the slab is triggered. In the Grey’s River and Teton forecast areas, the avalanche hazard will remain Considerable at the upper elevations. In the Togwotee Pass forecast area, where there is less snow with softer and thinner slabs, the avalanche hazard will be Moderate. Due to the unpredictable nature of persistent avalanche problems, backcountry travelers should use careful snowpack evaluation and cautious route-finding when traveling through the mountains tomorrow.

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