Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
Senza grado
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Non aggiornato — questo bollettino è scaduto 8 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The National Weather Service has issued a Winter Storm Warning through 5 AM on Monday. The general avalanche hazard could rise to Moderate before noon if forecasted snow and wind arrive. At the upper elevations, skiers and riders venturing into very steep, wind loaded terrain could trigger small to large slab avalanches along with loose snow sluffs. As the day progresses, the likelihood of triggering these slides will be on the rise as they increase in depth and volume. Avalanche activity is unlikely in most areas at the mid elevations, and insufficient snow exists for slides at the lower elevations. Don’t let the excitement of early season snowfall cloud your judgement. Evaluate the snowpack carefully, and be cognizant of the terrain below; even small slides can result in season ending injuries if skiers or riders are swept into bare, rocky slopes.

Problemi valanghivi

  • Wind Slabs

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

    In leeward terrain above 9,000 feet, strong southwesterly to westerly ridgetop winds will combine with sustained snowfall to build new wind slabs above rain crusts and firm old snow surfaces. By this evening, slab depths could reach 12 to 18 inches. As new snow accumulates, these slabs will become more sensitive to human triggers. Crusts that formed on high, northerly aspects from early October snow still provide a potential sliding surface, which would significantly increase the size of the resulting avalanche.

Avalanche Discussion

The best snow producing dynamics of this storm system are shifting east. Snowfall intensity will decrease overnight. A mix of clouds and sunshine with areas of snow showers are forecast for Monday. Westerly winds will subside to speeds of 15 to 25 with gusts to 35 miles per hour. Temperatures will be in the teens and 20s at the higher elevations and in the mid-30s in the valleys.The general avalanche hazard is expected to be LOW. At the upper elevations strong winds have created pockets of dense wind slab. Isolated areas of instability may exist in association with the two different buried crusts discussed. Some potential exist for humans to trigger dense wind slabs 6 to 18 inches deep on Friday’s crust. Dense slabs, up to 2 feet in depth, that lie on the hard crust at the base of the snowpack could be a serious problem if triggered by humans who venture into extreme terrain. Evaluate the snowpack carefully. Small avalanches can cause serious injuries if skiers, riders or hunters are swept into rocky areas, over cliffs or into terrain traps. Avalanches are unlikely below an elevation of 9,000 feet.

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