Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

Sat
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 5 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Sluffs of wet loose snow will become possible on steep slopes as soon as today's sunny warm weather melts through last night's refreeze. Some of these could entrain enough wet snow to cause problems for backcountry travelers especially on long steep slopes or in areas with terrain traps. The avalanche danger will rise to MODERATE today due to daytime warming.

Lawinenprobleme

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    Like yesterday, clear skies overnight allowed the snow to radiate enough heat into space for the surface to refreeze despite temperatures remaining above freezing. As the day warms up, intense sunshine and warm weather should melt through this refreeze. Gusty SW winds may help slow the melting process down on some upper elevation wind-exposed slopes. Still, most places should experience enough warming that sluffs of wet loose snow could become possible today. These wet loose avalanches may start small (D1) but could end up entraining enough wet snow to cause problems (D2) on longer slopes. Terrain traps like cliffs, gullies, creekbeds, etc could make the smaller wet loose avalanches have larger consequences. The most sun-exposed E-SE-S-SW-W aspects will be the most prone to wet snow instabilities, but the high sun angles and warm temperatures could allow wet snow to form on some of the NW-N-NE aspects as well.

    Snow conditions will change from supportable to wet loose quickly today. Signs that wet loose avalanches may be possible include things like roller balls, pinwheels, wet sticky snow, or ankle-deep wet snow. Recreating before the snow becomes unsupportable or using terrain less steep than 30 to 35 degrees without steeper slopes above can help minimize exposure to potential wet snow instabilities.

     

Avalanche Discussion

* Small wet snow instabilities like roller balls, pinwheels, and small sluffs of wet snow have been reported in several areas over the last few days. 

* Spring melt-freeze conditions exist on most E-SE-S-SW-W aspects. The snow surface on these slopes has been softening as the day warms up with a thick layer of wet unconsolidated snow forming by the afternoon. 

* Some upper elevation E and W aspects and many NW-N-NE aspects at all elevations still remain in between winter-like snow and spring melt-freeze conditions with a surface crust over colder dryer snow. 

* Many of the exposed near and above treeline N-NE aspects also still hold uneven wind-scoured and wind-sculpted snow surfaces. 

Abgedeckte Regionen