Bollettino valanghe

Togwotee Pass

Bridger-Teton Avalanche Center
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Pericolo valanghe

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

In sintesi

Avalanche conditions remain dangerous and difficult to predict. Hard slab avalanches ranging 2-4 feet deep can be triggered in steep terrain.  These slabs could be triggered on various aspects, but you'll most likely encounter this problem on north-facing terrain. Be alert to what terrain lies above and around you, move one at a time, and give runout zones a wide margin.  These avalanches can be triggered remotely from above, below, or next to slopes over 30°. Steep, rocky, and wind-affected slopes should be avoided. 

One skier was killed, and another was injured in an avalanche at Togwotee Pass. Details are here. 

Problemi valanghivi

  • Persistent Slabs

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

    Triggering a dangerous avalanche involving buried weak layers is likely today in steep terrain above 30°. Weak snow formed in early December is now buried ~2 feet deep in many locations and up to 4 feet deep in wind-loaded upper-elevation terrain. Avalanches involving these weak layers have been reported on most aspects at all elevations.

    Obvious signs of instability may not be present before triggering a persistent slab avalanche. Slabs could be triggered from a distance by the first rider or even wait until the last person in your group is riding the slope to release. Steep, rocky, and unsupported terrain features are most likely to produce an avalanche. However, given the well-connected nature of the weak layer, avalanches can propagate long distances across slopes. Because of this, avoid terrain connected to avalanche paths, beware of what lies above you, and give runout zones a wide margin. Remote triggers were reported as recently. Evaluating your travel plan carefully is essential when avalanches behave like this. Give tight gullies, creek drainages, tightly treed chutes, and other terrain traps a wide margin. For now, riding low-angle terrain less than 30° with no significant overhead hazard is the best way to avoid this problem.

     

    (1/5/2025)

    Looking up from the burial site at the remotely-triggered large avalanche off the west shoulder of Brooks Lake Mountain near Breccia. 

    Photo: Bridger-Teton Avalanche Center

Avalanche Discussion

Obvious signs of instability, such as collapsing, have decreased, but the snowpack around Togwotee Pass remains weak and unstable. A hard slab now sits on top of weak snow at the base of the snowpack. This is a perfect recipe for human-triggered avalanches. Digging down to the weak layer can provide useful information about the snowpack in the terrain you wish to ride. However, it is safe to assume that poor snowpack structure exists across the zone, and knowing exactly where a trigger point exists is very difficult. Conservative decision-making remains essential given the remote-propagation nature of the recently observed and triggered avalanches. Give yourself a wide margin today to allow for surprises.

 Please consider submitting an observation HERE. Observations allow everyone to gain a better and more complete understanding of conditions. Thank you.

Regioni coperte