Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
3 · Erheblich
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Kernpunkte

HIGH avalanche danger exists above 8,500' with CONSIDERABLE danger below 8,500'. Wind slab, wet slab, and wet loose avalanche problems are expected today. Travel in or below backcountry avalanche terrain or on or below slopes steeper than 35 degrees is not recommended today. Be aware of avalanche run out zones and the potential for large avalanches coming from high above. An avalanche warning remains in effect until 7 am Wednesday February 8, 2017.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    3

    The combination of high intensity snowfall and gale force winds over the upper elevations makes large wind slab avalanches very likely today. These wind slab avalanches are expected to initiate in avalanche start zones above 8,500'. Avalanches could run far towards the valley floor, well below snow level. Wind slab avalanches are most likely to occur on NW-N-NE-E-SE-S aspects today in near and above treeline terrain. Wind slabs could form in more limited areas on SW-W aspects as well as below treeline due to the strength of the winds.

    Avoid areas where blowing snow is depositing. Travel on or below backcountry slopes that hold top load or cross load cornice formations is not recommended.

  • Persistent Slabs

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

    Snow level has risen to 8,500' to 10,000' this morning. Rain on new snow has the potential to trigger wet slab avalanches below snow level on all aspects. Any weak layers that exist within the storm snow deposited over the past 24 to 36 hours could fail as a wet slab avalanche. Even relatively smaller wet slab avalanches can be destructive due to the increase in mass of the rain wetted snowpack.

    Avoid travel on or below slopes 35 degrees and steeper.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1

    Rising snow level will allow for increasing amounts of rain on new and old snow today. In rain on snow areas where the snowpack does not fail as a wet slab avalanche, wet loose avalanches are expected to occur on slopes 35 degrees and steeper on all aspects.

    Avoid travel on or below slopes where naturally occurring roller balls or signs of loose wet avalanches exist.

Avalanche Discussion

Observations made and received yesterday from the West Show Tahoe, Echo Summit, and Donner Summit areas revealed similar information. Strong to gale force ridgetop winds and significant amounts of blowing snow were observed. Newly formed wind slabs were difficult to trigger, but cracking was observed in some wind loaded areas. Snowpit tests indicated several weak layers within the storm snow with very limited signs of likely propagation. Snow level had risen to around 7,000' yesterday afternoon with increasing amounts of roller ball activity at and below 7,500'.

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