Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
Auf der Karte ansehen

Lawinengefahr

Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
Open full map
Veraltet — dieser Lagebericht ist 7 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

MODERATE avalanche danger will exist at all elevations today. Enough daytime warming should occur for loose wet avalanche problems to form and some lingering wind slab problems still exist. Human triggered avalanches remain possible today.

Lawinenprobleme

  • Loose Wet

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

    As soon as the sun hits the slopes today the new snow will start to warm. This daytime warming will allow loose wet avalanches involving most of the new snow to become possible. In areas where the loose wet avalanches can run long distances down steep sun-exposed slopes, they could entrain enough snow to have serious consequences for backcountry travelers. Sun-exposed E-SE-S-SW-W aspects will experience the most warming and be most susceptible to loose wet avalanche activity, but some wet snow may form on sun-exposed northerly aspects as well.  

    Once the snow starts to feel wet and heavy and/or small pinwheels or roller balls start to occur, it is time to move to a colder more shaded aspect. Moving to these colder aspects will provide better snow and less hazardous conditions. 

  • Wind Slabs

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

    Slabs of wind drifted snow still linger on leeward aspects in near and above treeline terrain. Human-triggered wind slab avalanches still remain possible today. These could involve enough snow to bury, injure, or kill a person in some areas. The warming that occurs today may make some of the wind slabs that exist on sun-exposed slopes easier to trigger.

    Cornices above a slope, drifted snow, and other wind created features can help identify where wind slabs may exist. Evaluate any areas where wind slabs may lurk carefully. Recreating in sheltered and shaded terrain should reduce exposure to avalanche hazards and provide colder more consistent soft snow. 

Avalanche Discussion

* A few small wind slab avalanches about 1 ft deep were reported on Mt. Lola yesterday. One of them was snowmobile triggered and the reporting party could see tracks going in and out of the avalanche. Two others were naturally triggered possibly by cornice failures.

* Snowmobile cuts on test slopes in the Mt. Lola area produced shooting cracks and smaller wind slab failures.

* Ski cuts on small wind loaded test slopes on Rubicon, Jakes Peak, and Talking Mountain also produced some cracking. On Rubicon and Jakes the cracking propagated a few feet away from the skiers and on Talking the cracking remained limited to just below the skier. Some continued wind transport was reported on the Echo Summit ridgelines. 

* Observations from sheltered areas on Brockway Summit, Rubicon, Jakes, and Talking Mountain did not find lingering signs of storm slab instability.

* Observers did report warming snow on sun-exposed aspects but loose wet instabilities remained small and isolated. One small loose wet sluff occurred on a SE facing slope on Jakes Peak and one on an E facing slope on Hidden Peak. In other areas, the surface snow just got wet and heavy without enough warming for loose wet instabilities to form. 

Abgedeckte Regionen