Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Veraltet — dieser Lagebericht ist 11 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Avalanche danger will rise to considerable today on slopes 32 degrees and steeper on all aspects and elevations due to wind slabs and storm slabs.  Natural avalanches are possible and human triggered avalanches will be likely today.  Areas of greatest danger will be along the Sierra Crest and South of Hwy. 50.  For other areas avalanche danger will range from Moderate to Considerable.  Dangerous avalanche conditions exist, cautious route finding and conservative decision making will be essential today. 

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2

    As the current storm impacts our forecast area, wind slabs will develop on NW-N-NE-E aspects above treeline, near treeline and even below treeline.  Winds are forecasted to be from the South at 40 to 50mph above 8000' with gusts up to 90mph.   Wind slabs will become larger and more dangerous throughout the day with human and natural avalanche activity expected.  These wind slabs will likely become large enough to bury a backcountry user.

    Make a plan for avoiding wind loaded terrain today.  Look for blowing snow, cornice formation, wind pillows, and snow surface clues to help identify where wind slabs are located.

  • Loose Dry

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

    Storm slabs could develop today in near treeline terrain and below treeline terrain on all aspects.  The weather forecast calls for potentially 8 to 15'' of new snow today with chances for the most snow along the Sierra Crest and South of Hwy. 50.  These storm slabs could have weaknesses at the old snow/new snow interface or within the current new storm snow.  Snowfall rates along the Sierra Crest could exceed 2''/hour today, easily over stressing the strength of the new storm snow.

    Avoid steeper slopes and terrain traps near and below treeline.  Use small, inconsequential test slopes to gather information.  Hand pits can be effective to see how the new storm snow is bonding to the old snow surface and for identifying weak layers within the new storm snow.  

Avalanche Discussion

Observations from Trimmer Peak (Luther Pass), Jakes Peak (West Shore), and Lincoln Ridge (Yuba Pass) all showed a consolidating snowpack with few issues moving forward.  Another day of cloudy and warmer conditions led to sticky snow conditions on all aspects below 7500' with some roller ball and small D1 wet loose avalanches in the afternoon hours.  The isolated, small, wind slab instabilities of the previous couple days were not reported to be an issue yesterday.

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