Bulletin d’avalanche

Togwotee Pass

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 9 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Skiers and riders venturing into steep, wind-loaded terrain above 9,000 feet could trigger small wind slabs. Above 7,500 feet, large to very large persistent deep slabs lurk on a variety of aspects. With afternoon snowfall and strong winds throughout the day, the likelihood of triggering both wind slabs and persistent deep slabs could increase as the day progresses. Monitor weather conditions and be willing to back off of high elevation terrain if a rapid loading event occurs in the afternoon. Below 7,500 feet, backcountry travelers might be able to trigger an isolated pocket of slab in very steep ravines and gullies.

Problèmes avalancheux

  • Deep Persistent Slabs

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

    Dangerous persistent deep slabs up to four feet in depth remain a concern on a variety of aspects above 7,500 feet. While large triggers, such as snowmobiles or the release of a wind slab, are more likely to cause failure of these slabs, the weight of a single person could still act as a trigger if a shallow weak zone is encountered. These slabs could propagate long distances and are likely to carry severe consequences to anyone involved.

  • Wind Slabs

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

    Strong southwesterly to westerly ridgetop winds have formed pockets of wind slab in leeward terrain above 9,000 feet. The light density snowfall on Wednesday was followed by much heavier snow resulting in upside-down conditions. Skiers and riders could trigger newly and recently developed wind slabs in steep, wind-loaded terrain. These slabs could range in depth from 6 to 12 inches with failure occurring on sun crusts, density breaks or down to a layer of surface hoar buried on January 19th.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )Northwesterly flow aloft will bring the next in a series of Pacific disturbances through the region overnight. After a brief midday lull, a second disturbance will move through in the afternoon. Overnight lows in the mountains will be in the upper teens before rising into the upper 20s during the day. Westerly ridgetop winds will range from 20 to 30 miles per hour.The general avalanche hazard is expected to be MODERATE above 7,500 feet on Saturday. Skiers and riders could trigger newly and recently developed wind slabs in steep, leeward terrain near high elevation ridgelines. These slabs, which are most likely to occur in the Tetons, could range in depth from 6 to 18 inches and fail on sun crusts, density breaks or down to a layer of surface hoar buried on January 19th. Dangerous persistent deep slabs up to five feet in depth lurk on a variety of aspects above 7,500 feet. While large triggers, such as snowmobiles or the release of a wind slab, are more likely to be able to cause failure of these slabs, the weight of a single person could still act as a trigger if a shallow weak zone is encountered. Below 7,500 feet, backcountry travelers might be able to trigger an isolated pocket of slab in very steep ravines and gullies that are mostly shaded from the sun.

Régions couvertes