Bulletin d’avalanche

Central Sierra Nevada

Sierra Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 8 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

MODERATE avalanche danger continues with a persistent slab avalanche problem at all elevations.  Large and destructive avalanches are still a concern throughout the forecast region.  Avalanche danger is expected to further rise over the next few days.

Problèmes avalancheux

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2

    Uncertainty continues to exist with this persistent weak layer that is buried 2 to 4' deep in the snowpack.  The last known avalanche that occurred on this weak layer was on Friday Jan 11.  Snowpack tests have mostly trended towards the layer gaining strength, but some tests continue to show that propagation is likely if the weak layer can be initiated.  The last avalanche occurred in complex terrain triggered by a large cornice failure.

    While the likelihood of triggering a persistent slab avalanche may be low, the consequences of a large destructive avalanche are high.  Talk with your group about managing terrain.  Avoid areas where large cornices exist above complex terrain.  

Avalanche Discussion

*  Observations came in yesterday from Upper Coldstream Canyon and Donner Peak (Donner Summit area), Needle Peak (Pole Creek area), Becker Peak (Echo Pass area), and DK's Canyon (East Shore area).  All of these locations were able to find the old buried facet layer.  Snowpack test results varied by location, with some continuing to produce propagation results with the ECT and PST.  Large surface hoar was seen in most areas.

*  Large massive cornices exist in many near and above treeline areas throughout the forecast region.   

Régions couvertes