Bollettino valanghe

Tetons

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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Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The avalanche danger is Moderate at the mid and upper elevations today. Above 8,500 feet it will be possible to trigger winds slabs in very steep terrain. Larger triggers such as groups or snowmobiles will increase the likelihood of triggering. Warming temperatures combined with periods of sunshine will make wet loose activity possible as the day progresses. Pay attention to snow surfaces as warming occurs. Move off of steep terrain as it becomes easier to penetrate the surface snow and plan exit routes accordingly. In the lower elevations the avalanche danger is Low, where avalanches are unlikely except for isolated pockets of shallow wet loose avalanches in very steep terrain.

Problemi valanghivi

  • Wind Slabs

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

    New snow amounts over the last 48 hours vary by location, ranging between 2-6”. Winds have been moderate to strong and out of the southwest. Yesterday there were reports of several avalanches intentionally triggered in Grand Teton National Park between 8,500-10,000 feet in very steep terrain. These avalanches were a foot in depth and large enough to injure or bury a person. While activity will not be widespread, it will be important to assess the snowpack for signs of wind loading prior to entering into committing terrain. Smooth, rounded, stiff and hollow snow surfaces are indicators that recent wind loading has occurred.

  • Loose Wet

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

    Warm temperatures will allow for the possibility of wet loose avalanches in very steep terrain. Volume is expected to be relatively low, but large enough to knock a person over or a snowmobile off track. During periods of clear skies expect the strong April sun to impact snow surfaces quickly and increase the likelihood of triggering.

Avalanche Discussion

Cloud cover has been on the increase this evening ahead of a weak trough of low pressure moving into the area. Overnight lows will dip into the low to mid twenties between 8,000-9,000 feet and rise into the low to mid thirties tomorrow. Precipitation will begin in the early morning hours with rain in the valleys and snow in the mountains. Daytime accumulations will be light, in the 1-3” range. Winds will be out of the southwest overnight and west tomorrow with average speeds in the 15-25 mph range. Cooling temperatures overnight will help to strengthen snow surfaces that loosened in the heat today. New snow amounts tomorrow will not be enough to increase the avalanche danger. The danger will be Low in the majority of terrain. One exception to this will be in very steep upper elevation shaded terrain. In that terrain it will be possible to trigger wind slabs up to a foot in depth. While the likelihood is on the low end of the scale, it is always important to assess the snowpack when entering into steep terrain. The other exception will be in steep lower elevation terrain where rain will weaken the snow surface and make small wet loose avalanches possible.

Regioni coperte