Bollettino valanghe

Summit Lake

Chugach National Forest Avalanche Center
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Pericolo valanghe

Sun
Alta quota
4 · Forte
Limite del bosco
4 · Forte
Sotto il limite
4 · Forte
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In sintesi

We have issued a Backcountry Avalanche Warning through the National Weather Service. Avalanche danger is HIGH at all elevations as heavy precipitation and strong winds will make very dangerous conditions where natural avalanches are likely. These could be large and trigger an deep avalanche on a layer of buried weak snow  capable of running to valley bottoms. Traveling in avalanche terrain is not recommended.

Problemi valanghivi

  • Storm Slabs

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

    We are in the throes of a region wide storm event that is estimated to deliver 2 to 4” of water by Sunday evening. Today the storm looks to pummeling the peninsula with heavy rain/snowfall and strong southeast winds gusting over 50 mph. Summit Lake may see over an 1” of water today falling as snow (6” to 10”) above 3000’.  Large natural avalanches in the new snow and windblown snow 1 to 3’ deep will be likely. What's most concerning is that these have the potential to trigger a deeper avalanche 3 to 5’ deep carrying avalanche debris to valley bottoms (Problem 2). Today may be a good day to wake up slow and do some puzzling. If anyone decides to venture in the storm to test out their gore-tex be sure to avoid traveling on or underneath steep terrain.

    The storm is supposed to reach its peak today.  The good news is that the rain/snow line is forecast to decrease to 1000’ by Sunday evening with another 0.5” of water expected. 

    Wet Loose Avalanche: Natural wet snow avalanches are likely releasing below 3000’. If the weather verifies a wet avalanche could run a long way and entrain a lot of snow capable of burying a human. Rollerballs falling or being blown off of rocky outcrops or trees are clues that the snow near the surface is becoming saturated and losing strength. This problem is most concerning on steep slopes above you as well in gullies and terrain traps where avalanche debris piles up. The safests option today is to steer clear of these areas especailly slopes above you that are steep enough to slide. 

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3.5

    Heavy rain and snow will add a lot of stress to the snowpack increasing the chance of triggering large avalanches 3 to 5’ deep. These will be fracturing on a buried layer of weak faceting snow in the lower half of the snowpack or near the ground. Natural avalanches in the storm snow or from the wind will be likely and could trigger one of these deeper avalanches. Two weeks ago the last big storm in Summit Lake created widespread avalanche activity on a variety of weak layers that ran to valley bottoms. If the weather verifies this storm could produce large avalanches as well. We recommend avoiding avalanche terrain today.

    (1/24/2025)

    Photo of the snowpit wall illustrating the weak layers near the ground with slab above.

    Photo: Mik Dalpes

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