Lawinenlagebericht

Togwotee Pass

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
3 · Erheblich
Waldgrenze
1 · Gering
Unterhalb
Keine Stufe
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Veraltet — dieser Lagebericht ist 7 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Avalanche conditions remain elevated due to yet another day of snowfall and strong winds. Two weak layers are buried deeply within the snowpack. The older weak layer was buried on November 25th and the more recent layer was buried on January first. Large to very large avalanches could be triggered on these layers. In addition to these deep instabilities, backcountry travelers could trigger newly formed wind slabs and loose snow sloughs. Above 8000 feet, cautious routefinding and avoidance of steep terrain is the best way to avoid the avalanche danger. At lower elevations, watch for specific terrain features that are loaded and beware of the run out zones of large avalanche paths.

Lawinenprobleme

  • Wind Slabs

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

    Strong southwest winds and new snow has formed shallow wind slabs in steep leeward terrain. These slabs lie upon recent density breaks within the upper portion of the snowpack and could have depths to twelve inches. They will increase in sensitivity in higher terrain as they are further loaded by new and blowing snow. Human triggered soft slabs and loose snow sloughs could be easily triggered in steep terrain. Although initially small, these events could sweep the unsuspecting over rocks and also entrain large volumes of snow.

  • Deep Persistent Slabs

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

    Hard slabs could be triggered by moving surface snow or by the weight of a person impacting a weak spot on a slope. These slabs could fail on two distinct weak layers. The higher layer was buried at the start of the new year and could release with depths one to three feet at the higher elevations and with depths to eighteen inches at the lower elevations. This buried weak layer lies on a variety of aspects and is made up of surface hoar, buried faceted snow, and on south facing aspects, crusts. A deeper pronounced weak layer was buried on November 25th. This hazard is limited to north facing terrain at 8000 feet and as elevation increases, involves more aspects. At 9500 feet west, north and east facing slopes can have this weakness. If triggered, slabs involving this layer could have depths to five feet.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )Snowfall is to increase after midnight tonight, with periods of heavy snowfall expected by sunrise. Eight to twelve inches could fall during that time. Lighter snow is to fall through the day. Temperatures are to stay on the cold side, with highs near ten degrees in the mountains. Southwest winds are to have averages between fifteen and twenty-five miles per hour. In the high elevations of the Tetons, the danger rating will continue to be High where more significant snowfall keeps natural avalanche activity as likely. At the mid elevations and in the other forecast areas, the danger will be Considerable. The scenario can be explained as the potential for failure on two deep persistent weak layers being possible, as described above. In addition to the deeply buried problems the chance for new shallow wind slabs and for loose sloughs that could have significant volume exist in steep terrain. Staying in lower angle terrain and avoiding terrain traps are the best way to avoid these avalanche problems.

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