Bulletin d’avalanche

Tetons

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 8 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Snowfall rates, ridgetop winds and temperatures all decreased overnight. As the day progresses, light snowfall will continue, and ridgetop winds will increase slightly. The chance for skiers and riders to trigger small to large wind slabs may increase through the day in leeward terrain above 8,500 feet. Be on the lookout for an unexpected loading event, and be willing to back off of travel objectives if conditions warrant. The chance lingers for backcountry travelers to trigger large to very large persistent deep slab avalanches in some areas above 7,500 feet. Below 7,500 feet, the snowpack is mostly stable and avalanches are unlikely.

Problèmes avalancheux

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Backcountry travelers might still be able to trigger persistent deep slab avalanches up to five feet deep in some areas above 7,500 feet. These low probability/high consequence avalanches are more likely to be triggered where faceted snow from December resides less than three feet below the snow surface. Large triggers, such as snowmobiles or cornice failures, are more likely to be able to impact this deeply buried layer.

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    As the day progresses, the chance for backcountry travelers to trigger newly developed wind slabs may rise in steep, wind-loaded terrain above 8,500 feet. By this evening, slab depths could range from 12 to 24 inches. Some chance may linger to trigger older wind slabs, particularly on sunlit aspects where sun crusts provide good sliding surfaces.

Avalanche Discussion

The upper level low pressure system over the Pacific Northwest will move eastward and make its way over the region on Sunday, and moderate intensity snowfall will continue overnight and into tomorrow. Overnight lows in the mountains will be near 10 degrees before rising into the mid-teens in the afternoon. Southwesterly to westerly ridgetop winds will decrease overnight before rising into the 20s during the day.The general avalanche hazard is expected to be Considerable on Sunday in high elevation terrain. On steep, leeward slopes skiers and riders could trigger wind slabs 12 to 30 inches in depth with the Tetons being on the higher end of the scale. Backcountry travelers might still be able to trigger persistent deep slab avalanches in excess of five feet in some areas above 7,500 feet. Below 7,500 feet, the snowpack is mostly stable and significant avalanche activity is unlikely. To find safe, high quality skiing and riding, seek out low angle terrain that is sheltered from the wind. Otherwise, utilize a conservative approach to terrain management.

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