Bulletin d’avalanche

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Périmé — ce bulletin a expiré 5 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Avalanche conditions remain dangerous. Yesterday on a southeast facing aspect of Mount Leidy on Togwotee Pass around an elevation of 9,600 feet, a snowmobiler triggered a persistent deep slab avalanche just after he made his turn while high marking. This avalanche failed near the ground and was estimated to be up to 8 feet deep. Unbelievably, the rider was able to outrun the slide. As this event illustrates, large to very large persistent deep slab avalanches remain a serious threat, and involvement in one of these slides will almost certainly result in another fatality. Skiers and riders still have the potential to trigger small to large wind slabs in steep, wind loaded terrain. Temperatures are starting out between 5 and 10 degrees warmer than yesterday. As the day warms, these slabs will become more susceptible to failure on sunlit aspects, and the chance for wet slides will likely develop. Don’t let blue skies impair your judgement. Continue to make conservative terrain choices, monitor temperatures and the impact of the sun, and transition to shaded terrain when snow surfaces start to become damp.

Problèmes avalancheux

  • Deep Persistent Slabs

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

    The Southwest Trails’ snowpack has poor structure, and backcountry travelers could easily trigger destructive persistent deep slab avalanches on a variety of aspects and elevations. Be particularly wary of south through east facing slopes. Daytime warming will increase the likelihood of triggering these slabs in sunlit terrain, and natural activity will be possible as temperatures heat up. These deadly slabs could also step down from the release of a wind slab. Slab depths are likely to range between 4 and 8 feet above 7,500 feet and 2 to 4 feet below 7,500 feet. Remember, previous tracks are not an indication of stability with a persistent deep slab problem.

  • Wind Slabs

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

    On steep, wind loaded slopes above 8,000 feet, backcountry travelers could trigger wind slabs with depths ranging from 1 to 3 feet. The likelihood of triggering these slabs will increase on solar aspects as the new snow is impacted by the sun for the first time. Natural activity cannot be ruled out during the heat of the day.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )A ridge of high pressure will begin to move into the region overnight and bring mostly clear skies on Monday. Overnight lows in the mountains will be in the low single digits before rising into the mid-twenties in the afternoon. Northwesterly ridgetop winds will back to the southwest at 10 to 15 miles per hour.Dangerous avalanche conditions will continue, and the general avalanche hazard is expected to remain Considerable on Monday. Skiers and riders have the potential to trigger small to large wind slabs in steep, wind loaded terrain. As the day warms, these slides will become more susceptible to failure on sunlit aspects, and the chance for wet slides will likely develop. Large to very large persistent deep slab avalanches will remain a serious concern, especially in the Togwotee Pass and Southwest Trails forecast zones. Daily warming will also increase the likelihood of triggering these deadly avalanches on solar aspects. Continue to make conservative terrain choices, monitor temperatures and the impact of the sun, and transition to shaded terrain when snow surfaces start to become damp.

Régions couvertes