Boletín de aludes

Waterton Lakes

Jan 17 – 20, 2014Parks Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Sat
Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Both wind slabs and cornices will become more sensitive to failure with heating. These events could provide the large load necessary to trigger a deep persistent slab. Be conservative with your terrain selection this weekend.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Strong west winds have created windslabs on lee slopes below ridgelines. These slabs can be found well down from the ridgetop and into open areas due to the intensity of the wind. Warm temperatures will increase the likelihood of triggering.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3
    Warm temperatures and sun will weaken the large cornices that developed from the snow and wind from last week. These could be the large load required to trigger the deeper instabilities in the snowpack and create large avalanches.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    2–3
    Snowpack depth is highly variable. It might be hard to spot the shallow areas where triggering this deeply buried weak snow is more likely. Large loads such as falling cornices or surface avalanches also have the potential to wake up these slabs

Weather Forecast

Temperatures in the valley bottoms are forecast to go into the teens for weekend and above zero into the foreseeable future. Conditions will remain dry and windy. Freezing levels are expected to reach mountaintop for a sustained period on Saturday. With these temperatures, solar radiation will have a profound effect on the steep solar aspects.

Snowpack Summary

Thursdays warmth and sun has created a crust on any steep south facing. Recent strong and turbulent West winds have created wind slabs in the lee of exposed features but even downslope from ridgetops, at all elevations. 30 to 40 cm above the ground weak, facetted snow remains a concern on steep or unsupported planar slopes especially in thin areas.

Avalanche Summary

There was some avalanche activity associated with the wind and storm slabs over the last few days. Thursday the warm temperatures were starting to cause snowballing out of rocky areas on steep southeast facing slopes.

Confidence

The weather pattern is stable

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