Bulletin d’avalanche

Tetons

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

The avalanche danger is Moderate at the mid and upper elevations today. Triggering an old wind slab is becoming less likely but remains possible on steep wind loaded slopes above 8,000 feet. Up to 4” of snow fell overnight with strong winds and have formed small wind loaded pockets on lee aspects. It is not likely that this new load will overcome the strength of the older wind slabs. Evaluate loaded terrain features and the snowpack carefully. In the high elevations on steep, sheltered slopes loose dry sluffs may be encountered. These will be small but can become dangerous in consequential terrain. Below 7,500 feet travel conditions will be difficult due to rain that fell yesterday evening. Temperatures did cool overnight, but you may find wet, unsupportive snow as the day warms. Post holing in wet snow deeper than the boot cuff is a sign that the snowpack is becoming weak. Below 7,500 feet the avalanche danger will be Low but could increase as the wet snow loses cohesion.

Problèmes avalancheux

  • Wind Slabs

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

    Wind slabs up to three feet thick have formed over the last week. Look for signs of drifted snow that can be identified by a smooth, rounded appearance. These may be found below ridge tops, in cross loaded gullies and at the base of cliff faces. Shooting cracks and hollow sounding snow are signs that the snow is unstable. Do not over commit to loaded terrain features without careful evaluation.

Avalanche Discussion

Overnight lows will be in the low twenties between 8,000-9,000 feet. Daytime highs will rise into the low to mid forties at this elevation band. Cloud cover will be on the decline overnight, with partly cloudy skies expected tomorrow. Winds will back from the west to southwest overnight, with average speeds in the 15-20 mph range at ridgetops.The avalanche danger will be Moderate tomorrow with wind slab and wet loose avalanches being the main snowpack issues to be aware of. With rising temperatures and the strong effects of the springtime sun, expect avalanche danger to increase during the day. Lingering wind slabs that have formed over the last week will be possible to trigger in steep upper elevation terrain. Larger triggers such as groups and snowmobiles may be required to trigger slab avalanches. The one-two combo of sun and warm air temperatures will make triggering more likely. Wet loose avalanche activity will also be possible in very steep sunlit terrain at all elevations. The likelihood of triggering wet avalanches will also be on the rise as the day progresses.

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