Bulletin d’avalanche

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Danger d’avalanche

Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Despite little new snowfall accumulation, human-triggered avalanches remain likely.  Of particular note are the middle elevations from 6500 to 8600 feet where more continuous weak snow layering has formed. It is possible today to trigger an avalanche that is 2-4 feet deep on both sunny and shady aspects. Evaluate snow and terrain carefully when riding or skiing, and move one at a time if exposed to steeper terrain features at all elevations.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Persistent weak layers formed during November are buried 2-4 feet deep across all aspects and elevations. Over the last several days, these layers have been sensitive to human triggering with one report of two snowmobilers fully buried. Remote triggering of these layers could also be possible with observations of cracks propagating over 200 feet. Evaluate snow and terrain carefully when riding or skiing, make conservative decisions, and avoid slopes with recent deposits of wind-drifted snow steeper than about 30°.

    (12/2/2022)

    Another look at that slide above the Squaw Creek Road. 5'9" human volunteered to provide a sense of scale. 

    Photo: Max Mogren

Avalanche Discussion

The recipe for a persistent avalanche problem is pretty simple. I've found it on every aspect in the Tetons apart from due south in the low and middle elevations. This year, the added complexity seems to be the elevation bands at which weaker snow has formed. Avalanches failing on buried surface hoar and thick layers of facets in the middle elevations can be tricky; these avalanches are capable of pulling out into lower slope angles and happen in less obvious avalanche terrain that can seem sheltered and safer. Additionally, slightly warmer temperatures and time have settled the middle-elevation snow into more of a slab.  You can find this combination of slab overlying a weak layer that is less consistent (and thus less predictive) in its reactivity almost everywhere you go today. The slab of new snow that has settled is thick enough that the wind doesn't need to have done any work to build a slab—avalanches are possible in both sheltered and wind-affected terrain.

Régions couvertes