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 13 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Large slab avalanches that have been releasing on approach by skiers and snowmobilers will slowly gain enough strength for people to venture out onto them before they fail. This scenario has huge consequences and merits a very conservative approach to avalanche terrain. Human triggered avalanches are likely and natural releases remain a possibility. Although these dangerous slabs can be triggered during the early morning hours there are expected to be more sensitive to failure during the warmer portion of the day. In these conditions stability evaluation results are difficult to interpret and uncertain.

Problèmes avalancheux

  • Persistent Slabs

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

    Large persistent slabs two to six feet in depth exist at all elevations and could be triggered on a variety of aspects. However, east and southeast aspects have have been the most active. These dangerous slabs have been triggered in areas where thick deposits of wind drifted snow exist in the starting zone. Weak spots on steep rocky slopes should also be considered likely trigger points. These avalanches are widely propagating, running fast and are producing large debris fields. With abundant sunshine in the forecast the sensitivity of these slabs to human triggers should increase as temperatures warm. Natural avalanche releases remain a possibility.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )A ridge of high pressure will dominate the west for the rest of the week. Steep temperatures inversions will develop with warmer air aloft and cold air pooling in the valleys. On Friday skies will be mostly clear. Temperatures at 10,500 feet will be in the mid teens at dawn and rise to near thirty degrees in the afternoon. In the valleys overnight lows will be near zero and daytime highs will rise into the upper 20s. Northwest winds are expected to finally diminish to speeds of 10 to 15 miles per hour.Large slab avalanches that have been releasing naturally or on approach will slowly gain enough strength for humans to venture onto them before they fail. This scenario has huge consequences and merits a very conservative approach to avalanche terrain. Human triggered avalanches are likely and natural releases remain a possibility. Although these dangerous slabs can be triggered during the early morning hours there are expected to be more sensitive to failure during the warmer portion of the day. The general avalanche hazard is expected to be CONSIDERABLE at all elevations in all of our forecast areas.

Régions couvertes