Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Veraltet — dieser Lagebericht ist 13 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Temperatures dropped overnight and have provided some strength to a snowpack that had natural and triggered avalanche activity yesterday. This activity occurred at low elevations where rain weakened the snowpack and at higher elevations where sustained strong winds and snowfall has created surface slabs. Yesterday a skier had a close call when he was caught and carried in a slide on Four Pines, an area south of the Jackson Hole Mountain Resort. Yet another storm is to bring rapid loading today. The avalanche hazard will quickly rise as new snow and potentially rain at low elevations adds to the existing avalanche problems of wind slabs and persistent slabs. A Special Avalanche Bulletin remains in effect for the area.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    The possibility exists to trigger recently formed wind slabs at the mid and high elevations. Strong southwest to west winds have formed dense slabs on leeward slopes. Slab depths to eighteen inches could be easily triggered and once triggered could step down to deeper weaknesses in the snowpack. These slabs have been most sensitive near and under cliff areas where graupel typically pools. These slabs will increase in size and sensitivity today.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2–3

    Buried layers of weak snow persist at all elevations. Slabs that lie upon these weaknesses could be triggered by backcountry riders and skiers today. These slabs could have depths to four feet and could be hard, soft, or potentially wet in areas affected by rain. These slabs will be most sensitive at low elevations where heavy snow and rain have weakened a snowpack underlain by faceted snow. Steep slopes, road cuts and roof slides could release naturally today. Yesterday these deep weaknesses were involved in natural wet slides in the Hoback Canyon as well as in a large avalanche that was reported to have initiated at high elevations in the South Fork of Phillips Canyon. The chance for riders and skiers to trigger these slabs will increase rapidly this afternoon as new snow and potentially some rain arrives with the next system.

Avalanche Discussion

A moist and active weather pattern with some breaks and periods of heavier precipitation will continue. At the lower elevations a rain/snow mix is anticipated to changeover to all snow after midnight. In the mountains up to six inches of new snow accumulation are possible overnight. Skies will be cloudy on Saturday with periods of heavy snowfall in the mountains and periods of rain and/or a rain snow mix at the lower elevations. Temperature are expected to be warmer than today with highs rising into the low 30s in the mountains and into the upper 30s to low 40s in the valleys. Winds will be westerly at 20 to 30 with gusts to 45 miles per hour.The general avalanche hazard is anticipated to be CONSIDERABLE at all elevations. Large wet slides are likely to be easily triggered by humans and could release naturally at the lower elevations. Large to very large slab avalanches continue to be a significant threat at the mid and upper elevations. These dangerous avalanches could be human triggered or release naturally. A Special Avalanche Bulletin remains in effect until 7 PM on Saturday evening. Expert route finding skills and snowpack assessment knowledge are essential for safe travel in avalanche terrain.

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