Bulletin d’avalanche

Tetons

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 10 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Backcountry riders and skiers have the potential to trigger soft wind slabs formed during the strong storm that impacted the area earlier in the week. Although gaining some strength, these slabs can still be found in very steep terrain at all elevations and will be largest at the higher elevations where wind transported significant snow onto leeward slopes. Do not allow sunny skies to impair good decision making. Careful snowpack evaluation and cautious route finding are essential today.

Problèmes avalancheux

  • Wind Slabs

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

    Recent heavy snowfall that was accompanied by strong southwest to west winds have formed dense surface slabs in steep avalanche terrain at all elevations. These slabs lie upon widespread faceted snow formed during last week's cold period. Caution is advised as many areas have stabilized yet unstable snow can still be found. These slabs could have depths to three feet at higher elevations, and eighteen inches at lower elevations.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–4

    A slight chance exists for larger loads to initiate very large and destructive deep slab avalanches that could involve the full depth of the snowpack. A deep slab involving this layer, released naturally during the recent storm cycle on Treasure Bowl, near Grand Targhee Resort.

Avalanche Discussion

Skies will be mostly clear with some areas of morning valley fog. Overnight lows will drop to near zero in the mountains and to around minus 20 in the coldest valley locations. Daytime highs will rise to near 20 degrees at all elevations. Winds will remain light and variable.Human triggered avalanches will continue to be a hazard in steep terrain at all elevations. Surface slabs formed by southwest to west winds during the recent storm cycle could be triggered by skiers or riders in steep wind loaded avalanche starting zones, cliff areas and steep couloirs. These slabs could be one to three feet in depth and could be more sensitive to human triggers during the warmer portion of the day. In steep active avalanche terrain that faces north above an elevation of 9,000 feet some potential may persist for humans to trigger full depth deep slab avalanches with severe consequences. These very dangerous slabs are more likely to be triggered by snow machines in the Togwotee Pass and Greys River areas. The general avalanche hazard is expected to be CONSIDERABLE in the Greys River area and the higher elevations of the Teton (>9,000 feet) and the Togwotee Pass (>8,500 feet) areas and MODERATE below those elevations. A conservative approach to active avalanche terrain is warranted.

Régions couvertes