Bollettino valanghe

Snake River Range

Bridger-Teton Avalanche Center
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Pericolo valanghe

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

In sintesi

Avalanches are unlikely in the majority of terrain today. Isolated areas of unstable snow may be found in very steep upper elevation terrain harboring older wind slabs. These slabs will be less than a foot deep, but could be large enough to knock you over. This is a more serious problem in terrain where a fall or loss of control has high consequences. Large avalanches involving weak layers buried 2-4 feet deep are unlikely.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1–1.5

    Soft slabs less than a foot deep were formed 48 hours ago by moderate/strong winds shifting from the west to northeast. These slabs are becoming harder to trigger, but could still be sensitive to the weight of a rider. This will be an isolated problem found on very steep (>35°), wind loaded starting zones above 9,000’. Easterly winds are an unusual wind direction in the Snake and may have formed slabs in terrain that does not typically see loading. Be on the lookout for pockets of unstable wind drifted snow, especially in rocky couloirs or near cliff bands. Triggering a small wind slab has the potential to knock you off your feet or machine and can have serious consequences above cliffs or other terrain traps.

    Additional Discussion:

    Temperatures are forecasted to be 5-10 degrees warmer than yesterday. Clear and calm conditions today may result in small wet loose avalanches that initiate in steep south facing terrain near cliffs. These slides will be relatively harmless to people except in consequential terrain.

    (1/22/2025)

    Cracking in unstable wind drifted snow.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1.5–2.5

    Weak layers of snow are buried 2-4 feet deep in the Snake River range. Triggering a large hard slab avalanche at these depths is very unlikely. Instability is most likely to be found in very steep, north facing terrain where the snowpack is thin and therefore weakest. Weak spots (trigger points) include wind-scoured areas, hanging snowfields above cliffs, and rocky terrain. Larger triggers such as groups, snowmobiles, or falling cornices, will increase the odds of impacting these weak layers. Choosing terrain that minimizes consequences and remaining vigilant if traveling in complex avalanche terrain continues to be a good call.

Avalanche Discussion

Weak layers that formed in early December are buried 2-4 feet deep in the Snake and are effectively dormant in most locations. The last avalanche involving these layers was reported nearly three weeks ago. Significant loading in the future could reactivate these layers and will be monitored with the return of stormy weather. For now, snow surfaces will continue to weaken over the next 4 days of high pressure and will be the primary layer of concern when snowfall returns to the region.

Please continue to send us your observations. Thank you!

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