Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 11 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

West to west-northwest winds have begun to build some shallow pockets of very soft slab in upper elevation avalanche stating zones and cliff areas. At the mid and upper elevations backcountry travelers could still trigger large to very large deep persistent slabs on a variety of aspects. If triggered, these deep, hard slabs are likely to carry severe consequences. Conservative terrain choices are warranted. The snowpack is mostly stable at the lower elevations where avalanches are unlikely.

Lawinenprobleme

  • Deep Persistent Slabs

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

    At the mid and upper elevations hard slabs, with depths to five feet, lie upon persistent weak layers of faceted snow. Large triggers, such snowmobiles or a the release of a small pocket of surface slab, may be necessary to cause failure of these basal facets. However, the chance continues for a single person to trigger one of these hard slabs, particularly in a shallow area where those weak layers are more easily impacted. Previous tracks and the lack of recent avalanche activity are not indications of stability.

Avalanche Discussion

Thermal inversions are expected to develop overnight and trap areas of fog in the valley until around noon. Skies will be mostly sunny in the mountains. Temperatures will drop into the single digits in the mountains and into the single digits below zero in the valleys. Daytime highs will rise into the 20s. Winds will be west to northwest at 10 to 20 miles per hour.Isolated pockets of wind slab less than a foot in depth could be triggered in cliff areas at the highest elevations. The primary hazard at the mid and upper elevations is hard slabs that lie upon persistent weak layers of faceted snow. In general these slab are more likely to be triggered in areas where the total snow depth is less than 50 inches deep and a little less little likely to be triggered but more consequential in areas with a deeper snow cover. These slabs could be 30 to 60 inches deep. The unstable areas are isolated but can be found on all aspects above 7,500 feet. We think these dangerous slabs could still be triggered by the weight of a single person but are more likely to be triggered by snowmobiles. The general avalanche hazard is expected to be MODERATE at the mid and upper elevations and LOW below an elevation of 7,500 feet where avalanches are unlikely.

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