Boletín de aludes

Northwest Coastal

Dec 10, 2016Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Sat
Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
1 · Débil
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Lo esencial

Outflow winds continue to build touchy wind slabs reactive to human triggers.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Winds have switched from southeasterly, then northerly, now easterly. Outflow winds are blowing at low elevations as well as high. Touchy wind slabs exist on a wide variety of exposed slopes.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–3
    A persistent weak layer of touchy surface hoar is buried 60-120 cm deep throughout the region, and may be reactive to human triggers. Smaller wind slabs may step-down to this layer resulting in large avalanches.

Confidence

Low - Wind speed and direction is uncertain

Weather Forecast

Saturday: Sunny / Moderate northeasterly winds / High of -15 C.Sunday: Sunny / Light to moderate easterly winds / High of -18 C.Monday: Sunny / Light to moderate northeasterly winds / High of -15 C.

Avalanche Summary

Wind slab avalanches are a concern in all areas within the region, and could easily step down to the surface hoar layer below. This surface hoar layer may remain reactive to human triggers for a longer period than is common for this region because it is being well preserved my cold temperatures. Last weekend, there were a couple of close calls with people being surprised by the touchiness of the buried surface hoar layer.

Snowpack Summary

Clear skies and strong outflow winds have created a variety of snow surfaces including scouring and hard wind slabs in exposed areas and up to 12 mm surface hoar formation in sheltered areas. Strong to extreme easterly winds over the past few days have created wind slabs on aspects you may not expect them. Wind slabs could be present on all aspects in exposed alpine, treeline, and even some below treeline locations. A layer of surface hoar which was buried around November 22nd is down 60-120 cm in many parts of the region. This layer is likely still reactive to human triggers. A thick rain crust exists 20-30 cm below the surface hoar layer, with isolated reports of weak facets (sugary snow) forming above the crust; however, that interface has not become a concern as of yet. Treeline snow depths are around 140-200 cm in the Terrace and Stewart areas, but substantially less further north. Concerns in the north are basal weaknesses that may exist in the shallower snowpack areas especially on smooth alpine features like glaciers.

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