Boletín de aludes

Jasper

Jan 3 – 4, 2017Parks Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Ice-climbers need to be vigilant this week particularly if climbing in the Mt. Cirrus area. A couple of slabs were noted above the climbs but they did not crest the wall.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2
    Cold temperatures and hard slab conditions make triggering less likely. Triggering from shallow spots remains a possibility.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    This layer will weaken with cold temperatures. Weak facets continue to develop above and below the November crust found 20-40cm above the ground.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Arctic temperatures faceting the surface snow causing it to loose cohesion and release loose dry avalanches in steep alpine rocky terrain. Some have enough mass to be concern particularly to ice-climbers in confined terrain.

Weather Forecast

Temperatures and winds remain arctic like. Expect light N winds, no new snow, and clear skies for the next three days.

Snowpack Summary

Surface snow is facetting with the arctic temps and loosing internal cohesion. Southerly slopes in the alpine have been stripped by previous SW winds with hard slab on lee features. At treeline, the snow is faceted that is barely supportive and weak in shallow areas.

Avalanche Summary

Good visibility Jan 2 highway patrol. Several loose dry avalanches up to size 2 on steep alpine rocky terrain all aspects. 4 slabs up to size 2.5 noted on Mt. Cirrus above polar circus ice climb. They did not crest the wall but critical for ice climbers to take these into consideration. 1 icefall on Athabasca glacier did not initiate a slab below.

Confidence

The weather pattern is stable

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