Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

Hochgebirge
1 · Gering
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 13 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

For today, avalanche danger is generally LOW. Pockets of MODERATE danger may form on NW-N-NE-E aspects on slopes 37 degrees and steeper due to rain on snow. Areas where light rain falls on sugary, faceted surface snow hold the greatest possibility of loose wet avalanches. Rain may fall as high as 8,000' to 9,500' across the forecast area today. Snow level will generally be higher in the southern half of the area. Avalanche danger is generally nonexistent on SE-S-SW-W aspects due to the lack of snow cover.

Lawinenprobleme

  • Loose Wet

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

    In areas where light rain falls on the snowpack today, the possibility of natural and human triggered wet loose avalanches exists. This will be most problematic in locations where rain falls on well developed near surface facets. Near treeline and below treeline NW-N-NE aspects below 8,000 to 9,500' is where this avalanche problem is most likely to occur. Some isolated E aspects or above treeline areas may become involved as well. Steeper slope angles upwards of 37 degrees may be necessary for avalanches to initiate.

    In areas where precipitation falls as snow, the new snow loading amounts of less than 1 inch are not expected to create any areas of slab avalanche instability.

Avalanche Discussion

Observations made yesterday in Upper Ophir Creek (Mount Rose Backcountry) showed a continuation of the forecast area wide snowpack trend of significant near surface faceting and buried facet layers within the snowpack. The snowpack that exists near treeline and below treeline on NW-N-NE aspects has shown indications that it is weak but stable at this time. As precipitation moves through the forecast area this week, it is important to understand that despite the persistent drought pattern the existing snowpack on NW-N-NE aspects is in poor condition to handle new loading from either rain or snow. Once significant precipitation is added, the existing snowpack is likely to rapidly change from stable to unstable.

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