Bollettino valanghe

Summit Lake

Chugach National Forest Avalanche Center
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Pericolo valanghe

Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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In sintesi

The avalanche danger is gradually increasing with the new snowfall and winds that started last night. If it continues to snow today, the avalanche danger will continue to rise. Human-triggered or natural avalanches on buried weak layers about 6 to 12" deep are possible today, especially in areas with recent wind loading. Remote triggering an avalanche from low-angle terrain on an adjacent steep slope is common with this type of weak layer. Avoiding terrain traps is a good way to reduce your exposure while the snowpack is being slowly stressed by new snowfall.

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SPECIAL ANNOUNCEMENTS:

The National Weather Service has issued a Winter Weather Advisory for the East Turnagain Arm, Turnagain Pass, and the Kenai Peninsula.

Our second Forecaster Chat of the season is coming up this Thursday, Jan. 8 at the Girdwood Brewery. The event is free, and the show will start at 6:00 pm. Come on down! More info here.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Recent avalanches: The most recent reported avalanche in the Summit Lake area was on Tenderfoot Ridge almost a week ago. Several human-triggered avalanches were observed in Turnagain Pass on Wednesday, many of which were triggered remotely. 

    The deep freeze is giving way to an active weather pattern this week, with snowfall starting last night and expected to continue throughout the week. The amount of new snow we receive will determine how quickly the avalanche conditions become more dangerous. Weather models are not in great agreement about how much new snow is coming, but NWS forecasters are leaning towards the higher end of the model predictions. So far, about 1 to 2" of new snow (0.1" water) has fallen in Summit Lake, with the potential for another 1 to 3" of snow (0.2" water) throughout the day today. 

    Thanks to the prolonged cold and dry weather the past month, the snowpack throughout the forecast zone is weak. Our biggest concern is a layer of facets underneath a crust about 6 to 12" deep. As more new snow starts to pile up, the likelihood of triggering and the size of avalanches on this weak layer are rising. This type of weak layer can be triggered remotely, meaning you could cause an avalanche on an adjacent steep slope even if you are standing on low-angle terrain. 

    Wind slabs: In addition to the potential for triggering avalanches on buried weak layers in problem 1, there is also the potential for human-triggered avalanches about 6-12" deep in wind-loaded areas along ridgelines and exposed terrain features. Easterly winds arrived with the snowfall and averaged 15 to 20 mph with gusts to 35 mph overnight. These winds are expected to back off today, but we expect wind slabs that formed overnight to remain touchy today. You can keep an eye out for shooting cracks and hollow feeling pillows of wind-transported snow at upper elevations to identify where wind slabs are located. 

    NWS snowfall forecast for Monday at 3am through Tuesday at 3am.

    Photo: NWS Anchorage Office

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