Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

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

Kernpunkte

Conditions remain dangerous at the mid and upper elevations. Natural and human triggered slab avalanches occurred yesterday on west through north to east aspects. Some were triggered from flat areas by skiers on approach. Natural activity occurred on Freds Mountain in terrain that has not experienced avalanche activity in over 20 years. A snowboarder was caught, carried 800 feet and partially buried in a steep northeast facing avalanche path south of Teton Pass. Similar events are likely to be triggered by skiers and riders today. These slides are large with depths to one meter. Avalanches are unlikely in areas at the mid and lower elevations where the new snow that has fallen since last Sunday has accumulated on bare ground. Excellent terrain evaluation skills, a knowledge of the extent and distribution of persistent weak layers and conservative terrain choices are essential for safe travel in avalanche terrain.

Lawinenprobleme

  • Persistent Slabs

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

    Large to very large slab avalanches are likely to be human triggered today in steep terrain at the mid and upper elevations that are highlighted in the accompanying aspect/elevation diagram. These dangerous slabs are likely to be two to three feet deep. They will fail on buried weak layers of surface hoar and faceted snow that lie on the interface between snow that has fallen since last Sunday and snow that fell earlier in the season. In today’s scenario these persistent slab avalanches are especially dangerous because they can be triggered from flatter areas below steep slopes, may fail on a slope that has previous tracks, may propagate long distances, may occur on slopes that rarely slide and may occur in treed areas.

Avalanche Discussion

Southwesterly flow aloft will start to bring another round of snowfall overnight and through the day on Monday. Overnight lows in the mountains will be in the mid-teens before rising into the mid-20s during the day. Southerly to southwesterly ridgetop winds will range from 20 to 30 miles per hour.The general avalanche hazard is expected to remain Considerable on Monday, and conditions will continue to be dangerous on steep slopes that held snow prior to last Sunday. This terrain generally includes all aspects above 9,000 feet and northerly slopes down to 8,000 feet. Skiers and riders venturing into these areas are likely to trigger large to very large slab avalanches and natural activity will be possible. New snowfall, snow available for transport and strong winds will exacerbate this hazard. Knowledge of the extent and distribution of the faceted weak layers of concern will be essential for accurate terrain evaluation. Monitor wind loading and new snowfall throughout the day and be willing to alter your travel plans if conditions warrant.

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