Boletín de aludes

Jasper

Apr 2 – 3, 2017Parks Canada
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Archivado · caducó 9 years ago

Peligro de aludes

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

Weaknesses deep the in the snowpack can be triggered from shallow areas or by large triggers. Daytime and solar heating will weaken cornices, avoid traveling under or to close to them.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    New windslab formed by recent SW winds could be reactive and if triggered, could step down to the deep persistent slab.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Cornice failure is hard to predict but is more likely with inputs like solar radiation and wind-loading.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–4
    This problem is unlikely to disappear. It can be triggered by large loads like cornice fall or windslab failure. Human triggering is most likely from shallow spots or on steep unsupported slopes.

Weather Forecast

Light flurries Monday afternoon with a mix of sun and cloud, light winds from the NW. Freezing level up to 1600m with an alpine high of -5. Clear skies and warming temps for Tuesday and Wednesday.

Snowpack Summary

12cm new snow in the past 36hrs, winds gusting to 60km/hr from SW building slab. The mid-pack is bridging the basal weakness, which consists of weak facets, depth hoar and the Nov rain crust. Isothermal conditions below tree-line on solar aspects.

Avalanche Summary

Recent cornice and windslab failures have triggered the deep persistent slab creating large full path avalanches that are traveling into valley bottoms. Loose wet avalanches have been occurring on steeper south and west aspect below tree-line.

Confidence

Timing or intensity of solar radiation is uncertain on Tuesday

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