Boletín de aludes

Jasper

Apr 1 – 2, 2017Parks Canada
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Archivado · caducó 10 years ago

Peligro de aludes

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

Resist the temptation to travel on big slopes that have not yet avalanched.  Weaknesses deep in the snowpack can be triggered from shallow snowpack areas and have the potential to run full path. 

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
    1–3
    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.

Confidence

Timing or intensity of solar radiation is uncertain on Tuesday

Weather Forecast

10 cm of snow expected Saturday night with easing SW winds.  Freezing level falling to 1300 m.  Cloudy spring-like weather Sunday and Monday.  Sun and warm temperatures are predicting starting on Tuesday.

Snowpack Summary

Recent large cornices failures have triggered the deep persistent slab creating size 3 avalanches. Previous S-M SW winds formed windslab on lee aspects. A thick and strengthening mid-pack is bridging basal weakness. The lower snowpack is weak with depth hoar, Nov rain crust and basal facets. 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 well into historic run-outs. Loose wet avalanches have been occurring on steeper south and west aspect below tree-line.

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