Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
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Lawinengefahr

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

Kernpunkte

LOW avalanche danger exists this morning while the snowpack remains frozen. As the day warms up and last night's refreeze melts, pockets of MODERATE danger will quickly form slopes steeper than 35 degrees on E-SE-S-SW aspects due to the possibility of loose wet avalanches. Small human triggered roller balls, pinwheels, and point-releases should comprise most of the loose wet activity, but some loose wet avalanches could involve enough snow to cause problems for backcountry travelers. 

Lawinenprobleme

  • Loose Wet

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

    Even though the temperatures should not climb quite as high today as the last few days, daytime warming and some sunshine should be enough to melt through last night's weak refreeze. This warming and melting will allow enough wet snow to form that loose wet snow avalanches will be possible again today. Since the snowpack has already been through 9 days of melt-freeze cycles, these loose wet problems have become smaller and more isolated. Small human triggered roller balls, pinwheels, and point releases should represent the majority of the loose wet avalanches today, but a few of them could still entrain enough snow to cause problems for backcountry travelers in isolated areas or extreme terrain especially in areas where the melt freeze snow still has not transitioned to corn snow. E-SE-S-SW aspects should hold the best potential for loose wet problems. Depending on the amount of cloud cover today, some wet snow could start to form on N-NE aspects as well. 

    Stepping off your equipment and sinking into wet snow above your boots can indicate that enough wet snow exists on a slope for a loose wet avalanche problem. Small loose wet instabilities like roller balls and pinwheels can foreshadow larger loose wet snow issues as well. These clues or other signs of wet snow issues mean that it is time to find a more frozen slope or switch to a different afternoon activity.

Avalanche Discussion

Yesterday observations from Red Lake Peak and Tallac showed minor wet snow instabilities in the form of small human triggered pinwheels and small natural loose wet point releases on E aspects after 11 am. On Red Lake Peak, SE aspects up to 9600 ft. had a few inches of soft corn snow above a supportable melt-freeze crust between 10:30 am and 12 pm. Observers on Andesite Ridge did not see any recent loose wet snow avalanches on the SSW faces of Castle Peak yesterday prior to noon. On the N-NE aspects in all 3 of these areas, a mix of snow surface conditions ranging from scoured icy crusts in exposed near and above treeline locations to patches of soft cold snow in sheltered locations to widespread thin breakable melt freeze crusts existed. Snowpit data and general observations on the northerly aspects did not reveal any signs of instability. 

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