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 10 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

MODERATE avalanche danger will form on sun-exposed E-SE-S-SW-W aspects steeper than 35 degrees at all elevations as loose wet avalanches become possible due to daytime warming today. Enough warming may also occur on the low elevation NW-N-NE aspects for some loose wet activity as well. Some loose wet snow avalanches could entrain enough snow to pose a threat to backcountry travelers today especially in areas where terrain traps exist. Evaluate snow and terrain carefully and identify features of concern. 

Problèmes avalancheux

  • Loose Wet

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

    More strong March sunshine and warmer daytime highs will melt through last night's refreeze and allow a deeper layer of wet snow to form on sun-exposed slopes today. Loose wet avalanches involving this wet snow will become possible again today. Small roller balls, pinwheels, and point releases should comprise the majority of the loose wet avalanches today, but enough loose wet snow could form for some larger loose wet avalanches to occur. Some of the loose wet avalanches could entrain enough snow to cause problems for backcountry travelers. Slopes steeper than 35 degrees on sun-exposed E-SE-S-SW-W aspects at all elevations will hold the best potential for loose wet activity since they should experience the most warming, but some of the lower elevation NW-N-NE aspects could also see enough sun for some wet snow issues to form.

    Signs of more problematic loose wet avalanche activity include sinking into wet snow above your boot tops and small surface instabilities like roller balls, pinwheels, or point releases. Once the surface snow becomes wet and deep it's time to change aspects to find more frozen slopes or move off and away from slopes that are 35 degrees or steeper. Terrain traps like gullies, creeks, and cliffs can greatly increase the risk of any size loose wet avalanches.

Avalanche Discussion

Yesterday observations on Tamarack Peak and Incline Lake Peak in the Mt. Rose area and on Rubicon and Jakes Peak on the West Shore found similar conditions. Observers reported minor scouring near upper elevation ridgelines from overnight winds and little to no wind transport during the day. Signs of settlement and consolidation existed in all of these areas on the northerly aspects at all elevations. The snow on the upper elevation northerly aspects remained cold and soft in these areas yesterday. Heavy, wet, sticky snow had formed on sun exposed aspects including the lower elevation N aspects by mid day, and some roller balls and pinwheels occurred on the E-SE-S-SW aspects at all elevations yesterday. 

Régions couvertes