Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
Auf der Karte ansehen

Lawinengefahr

Hochgebirge
1 · Gering
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
Open full map
Veraltet — dieser Lagebericht ist 10 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

LOW avalanche danger exists on all aspects and elevations. LOW danger does not mean "no danger" and small unlikely but not impossible avalanches could still occur in isolated areas or extreme terrain. Practice safe backcountry travel habits like moving one at a time from safe zone to safe zone while traveling through avalanche terrain. Early season conditions exist with numerous exposed and shallowly buried obstacles in most areas.

Lawinenprobleme

  • Cornices

    • Alle Höhenlagen
    Wahrscheinlichkeit
    Possible
    Größe
    0

    Triggering an avalanche remains unlikely today; however, some unstable snow could still exist on isolated terrain features especially in complex or extreme terrain. Even though the avalanche danger remains LOW continue to practice safe back-country travel habits. Make a travel plan, discuss it with your group, and share it with someone who will not be on your trip. Continue to evaluate the snowpack and terrain and watch out for those isolated terrain features where unstable snow may remain. When moving into or through potential avalanche terrain, only expose one member of your group at a time. Identify safe zones out of avalanche terrain and re-group in those areas. Practicing these techniques now will make them habits that will serve you well when increased avalanche danger exists.

    While LOW avalanche danger means less avalanche hazard, the shallow snowpack means more exposed or barely covered rocks, logs, stumps, trees, and other hard immovable objects to hit. Collisions with these obstacles can break equipment and people. Enjoy the snow, but be careful so that the enjoyment will last all season long.

Avalanche Discussion

Yesterday observations from Becker Ridge, Castle Peak, and Relay Peak showed a mix of snow surface conditions ranging from wind crusts to sun crusts to wind scoured slopes to warm sticky snow to soft cold snow. The near and above treeline N-NE-E aspects held wind scoured slopes with firm icy surfaces while the sheltered N facing slopes in near and below treeline terrain still held areas soft unconsolidated snow. At the upper elevations on Castle Peak and Relay Peak this soft snow remained cold, but at the lower elevations on Becker Ridge, it became wet and sticky as the day warmed up.

Snowpit data from all three of these areas found layers of weak sugary snow in the bottom third of the snowpack. On Becker Peak below 8000 ft. this weak layer exhibited signs of slowly consolidating; however, at the higher elevations where the snowpack remained colder on Castle Peak and Relay Peak it showed signs weakening. Tests on these persistent weak layers indicated that triggering them remains unlikely at this time, but that they have the potential to re-activate under future loading on the colder upper elevation N facing slopes. These layers could become the foundation for the next persistent slab problem when more snow arrives in the region. So far these persistent weak layers exist and remain weak on N aspects along the Sierra Crest above 8300' and in the Mt. Rose area above 9300'. There have been no avalanches associated with these layers.

The Sierra Crest north of Tahoe City and the Mt. Rose backcountry harbor the deepest and most usable snowpack within the forecast area. Even in these more snow covered areas early season conditions still persist and many obstacles remain. Along the Sierra Crest south of Tahoe City, the snowpack becomes more shallow with many more exposed and barely covered obstacles even at the upper elevations.

Abgedeckte Regionen