Bollettino valanghe

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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In sintesi

Above 8,000 feet on East, North, and West aspects it will be possible to trigger a persistent slab avalanche with depths to four feet. This week there have been daily reports of backcountry travelers triggering these slides and many near misses. Today, the impact of a winter storm could increase the sensitivity of these persistent layers and form shallow wind slabs on leeward slopes. The release of a small wind slab could also trigger a larger avalanche. Below 8,000 feet, the avalanche hazard is Low and avalanche activity will be limited to small slides on steep isolated terrain features. Riders and skiers should monitor the development of this storm and be aware of areas with a heightened hazard today.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Persistent weak layers can be tricky to predict and may not show any warning signs until it is too late. This week, there have been reports of remotely triggered avalanches throughout this forecast zone. Snowfall since March 5 has formed into a slab over crusts and weak faceted snow. These slabs have depths of one to four feet and range from soft to hard, with the denser slabs at the upper elevations on wind-loaded slopes. Persistent avalanches can also be triggered from below the slope, so it is advised to stay out from under avalanche terrain today.

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1

    Strong winds from the south, west, and north along with today’s snowfall will form small wind slabs at the upper elevations in the afternoon. These wind slab avalanches are expected to be small, with depths less than a foot, on steep wind loaded terrain features. As winds change direction with the passing cold front, loading patterns will change and slopes could be cross loaded.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )A winter storm will begin to impact the area tonight and last through tomorrow. Southerly to southwesterly winds will increase into the twenties and thirties with gusts into the forties. Light snow overnight will become widespread by early Sunday with the heaviest snowfall forecasted from 4 am through 2 pm. Accumulation is forecasted to be three to eight inches in the mountains with one to three inches in the valleys. Mountain temperatures will start in the low twenties and warm into the mid to upper twenties.While the avalanche hazard is expected to be Moderate in all three forecast areas tomorrow, the size and distribution of these slides vary in each zone. In the Grey’s River area, these slides have been reported daily and on steep avalanche terrain, large avalanches could be possible. In the Tetons, the distribution of large avalanches seems to be isolated to slopes that had a thin snowpack prior to the March snowfall. On Togwotee Pass, the poor structure is widespread but there are limited areas where a slab exists to complete the recipe for an avalanche. New wind and snow will increase the potential to trigger a persistent slab avalanche and form shallow wind slabs at the upper elevations. Backcountry travelers should monitor the development of the storm and be aware of areas with a heightened hazard.

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