Bollettino valanghe

Douglas Island

Coastal Alaska Avalanche Center
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Pericolo valanghe

Mon
Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 4 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Hazard is at low for all elevations of Douglas Island again today. Human triggered avalanches are unlikely with the exception of wet loose slough on any steeper slopes. These skier/rider triggered sloughs can gain mass and momentum quickly and can run for a long way. Larger wet slab natural avalanches remain possible and are very hard to predict where and when they may go, it is important to still practice good travel habits and terrain selection.If you’d like your business to sponsor a forecast, please email: [email protected]    

Problemi valanghivi

  • Loose Wet

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

    Wet loose avalanches often start small but can grow large as they entrain snow. Wet loose avalanches are especially hazardous in steep exposed terrain and above terrain traps such as cliffs and gulleys. Signs of wet loose activity include wet saturated surface snow that feels unconsolidated, pinwheels and rollerballs on slopes, and snow shedding off rocks and trees due to solar heating. 

  • Cornices

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

    Cornices are unpredictable and can fail without warning. Cornice failures can put a significant load on the slopes below them which can often trigger large avalanches.  When traveling on ridgelines, cornices often fail much further back from their edges than expected. Cornices should be given a wide berth when traveling on corniced ridges and time spent under cornices should be minimized. This month there have been many observed cornice failiures triggering  larger avlanches. 

  • Wet Slabs

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

    Wet slab avalanches occur when water penetrates the snowpack and causes a failure at a buried weak layer or interface. Solar radiation, which produces meltwater that percolates through the snowpack, can trigger wet slab avalanches, along with rain on snow events. Wet slabs are generally more destructive and more difficult to manage than wet loose avalanches; they can break widely and without clear warning signs.

Avalanche Discussion

The primary concern is wet loose avalanches, along with the potential for cornice failure triggering deeper, more destructive slabs. Wet slab avalanches are also possible, particularly if initiated by wet loose activity or cornice fall. Both Douglas Island and the mainland have seen numerous recent examples of this activity over the past couple of weeks. While we are well into the Spring thaw, is important to remain vigilant and follow best backcountry practices. Have skiers, riders, and snowmachiners travel through avalanche terrain one at a time while maintaining eyes on the rider on the slope. Practice beacon checks and ensure you have proper rescue gear. Stay alert to overhead hazards, and watch for signs of unstable snow, especially on isolated terrain features. Identify and avoid features of concern. 

Regioni coperte