Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

Hochgebirge
1 · Gering
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
Veraltet — dieser Lagebericht ist 12 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

The avalanche danger should remain LOW today for all aspects and elevations. LOW danger does not mean no danger and unlikely does not mean impossible. Some small, shallow, isolated areas of unstable snow could still exist on some isolated terrain features. Continue to practice safe travel habits and thoughtful decision making when traveling in the backcountry.

Lawinenprobleme

  • Cornices

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

    Avalanche activity remains unlikely today. Some small, isolated wet snow insatbilities like pinwheels, roller balls or wet loose sluffs may form on all aspects today due to daytime warming and the increase in cloud cover. The clouds will act as an insulating blanket that will prevent the snowpack from cooling itself with radiational cooling and allow today's warmth spread to northerly aspects. If some rain does actually fall on the snowpack, wet snow instabilities may become more widespread.

    Some small, isolated areas of potentially unstable wind slabs that may still linger in near and above treeline terrain represent the other unlikely and mostly benign issue. In the few areas where these slabs might remain, they should also have become difficult to trigger. In the unlikely event that a person did find a human-triggereable wind slab, it should not invovle enough snow to do much more than knock a person down or push a person off his/her intended course. In most areas this issue would represent more an inconvinence than an actual problem unless it occurs in areas that magnify the consequences of any size avalanche or where any stumble or fall can have serious consequences. These kind of places include steep couliors, slopes above cliffs, and other complex or extreme terrain.

Avalanche Discussion

Yesterday on Chickadee Ridge consistent cloud cover kept the snow surface from softening before noon on the typically sun-exposed southerly aspects. These surfaces likely did soften during the afternoon. On the northerly aspects 2-3 inches of soft snow existed above the old surface crusts. In most places this snow remained cold and dry, but patches of wet, sticky snow existed where patches of sunshine existed.

Below the soft surface snow on the northerly aspects, observations showed that the old crusts are eroding and softer layers of snow remained below these crusts. These layers feel soft and weak, but tests on these layers still indicated that if they do break, the resulting fracture is not likely to travel very far. This layer still needs to be watched and tracked to see what it changes into before the next storm because it still has potential to become a persistent weak layer.

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