Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
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In sintesi

Dangerous avalanche conditions exist in some areas at the mid and upper elevations. Up there, skiers and riders could trigger large persistent slab avalanches in steep terrain. While the likelihood of triggering these avalanches is decreasing, the consequences remain the same. Being caught in one of these slides could easily result in a fatality. As the basal weak layers continue to get stronger, backcountry travelers can get farther out onto a slope before triggering one of these slabs, and this scenario increases the likelihood of being captured. Don’t let previous tracks lull you into complacency; preceding riders may have simply missed hitting a trigger point. Cautious route finding and conservative terrain choices will continue to be necessary for safe travel in avalanche terrain. Avalanches are unlikely at the lower elevations.

Problemi valanghivi

  • Persistent Slabs

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

    Weak layers of faceted snow persist near the base of the snowpack on slopes that held snow prior to Thanksgiving. These areas generally include all aspects above 9,000 feet and west through north to east facing slopes between 8,000 and 9,000 feet. There, backcountry travelers could trigger persistent slabs with depths of two to four feet. The basal weak layers are slowly adjusting to the previous week’s loading event. Some of these slopes are stable, others are not, and it is difficult if not impossible to differentiate between the two. Patience is key with a persistent slab avalanche problem. If you choose to ski or ride in terrain where these basal weak layers are present, you are rolling the dice.

Avalanche Discussion

Skies will be partly cloudy. Temperatures will drop into the teens and 20's tonight and will rise into the 20's and 30's on Monday. Winds will be from the south to southwest at 15 to 20 miles per hour with higher gusts.Large slab avalanches can be triggered by humans in steep terrain at the mid and upper elevations. These slabs are mostly likely to be triggered by skiers, snowboarders and snowmobilers in steep avalanche prone terrain on northeast through northwest aspects between an elevation of 8,000 and 9,500 feet but could also be triggered on east through north to west aspects at those elevations and on a variety of aspects above an elevation of 9,500 feet. These dangerous slabs could be triggered by the weight of a single person and can be triggered on slopes with previous tracks. If triggered they will fail on a persistent weak layer of faceted snow near the base of the snowpack. They could be 2 to 4 feet deep. In these areas the general avalanche hazard is moderate. The general avalanche hazard is low below an elevation of 8,000 feet.

Regioni coperte