Boletín de aludes

South Rockies

Jan 14 – 15, 2019Avalanche Canada
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Archivado · caducó 8 years ago

Peligro de aludes

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

The possibility remains of triggering a deep layer of sugary facets. A diligent approach to avoiding steep, thin and/or rocky slopes is required.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Small wind slabs may be triggerable from wind loaded slopes. The real danger is if a small slab stepped down to the lower weak layer.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3.5
    Deeply buried weak layers remain a concern, especially as temperatures rise and the sun comes out. Large loads like cornices may trigger this layer as well, and cornice failures become more likely during warm, sunny conditions.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

MONDAY NIGHT: Clear skies. Temperatures dropping to around -14C.TUESDAY: Dry and sunny above some valley cloud. Expect cool treeline and alpine temperatures, around -4C. Light winds.WEDNESDAY: Dry with a mix of sun and cloud. Treeline temperatures around -6C. Light southwesterly winds.THURSDAY: Light snowfall, 2-4 cm. Treeline temperatures around -9C. Light easterly winds.

Avalanche Summary

On Saturday a size 2 natural deep persistent slab avalanche was observed on a south facing feature around 2100 m, more details here. There is also a great MIN report from the neighboring Lizard Range where a group of sledders share about their near miss on a steep southwest facing feature at ridgecrest.On Friday we received a great Mountain Information Network observation of natural activity on solar aspects, more details here. A size 2-2.5 natural avalanche was also reported on a north aspect at 2200 m on Friday. This avalanche was likely triggered by a rock fall, and ran on the deep persistent layer at the base of the snowpack.

Snowpack Summary

Recent warm alpine temperatures have created moist/crusty surfaces on southerly aspects. The snow appears to have remained dry on northerly aspects.Large variability in snow depths still exists in the region, ranging from almost no snow to nearly 200 cm in some areas. For average snowpack areas, expect to find weak and sugary faceted snow around 50 to 100 cm deep, which extend to the ground. This weak bottom half of the snowpack has been the culprit for large avalanches in the region over the past few weeks.

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