Boletín de aludes

South Coast

Apr 7 – 8, 2015Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

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

Sunshine are warmth are the primary drivers of avalanche hazard. Avoid sun exposed slopes in the afternoon, and stick to higher, shady aspects for the best snow.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–4
    Daytime warming and sunshine could weaken large overhanging cornices and cause them to fail. These are a hazard alone, but also a potential trigger for deeper weak layers.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–5
    A couple persistent weak layers are still present in the upper snowpack. These have not been reactive for a few days now, but intense spring sun or cornice falls could be enough to reawaken this problem. 

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    Expect loose wet activity on steep sun-exposed slopes during the day.

Confidence

Good - The weather pattern is stable

Weather Forecast

Wednesday: Mainly sunny. The freezing level climbs to around 2000 m during the day and drops below 1500 m overnight. Winds are light and variable. Thursday: Mainly sunny. The freezing level climbs to around 2000 m during the day and drops below 1500 m overnight. Winds are light and variable. Friday: Cloudy with light to moderate snow. The freezing level lowers to 1500 m and winds increase to moderate or strong from the S-SW.

Avalanche Summary

Moist loose avalanches have been reported on steep sun-exposed slopes, and one natural cornice fall (size 2) was reported on Monday. This cornice did not trigger a slab on the slope below.

Snowpack Summary

On shady slopes, 20-30 cm of low density storm snow sits on a strong and supportive rain crust that was buried last Saturday and extends as high as 2100m. Previous west-southwesterly winds have created thin new wind slabs in lee terrain, especially high N aspects. Expect an ongoing melt-freeze cycle on sun-exposed slopes. A facet/crust layer that was buried in mid-March is now approximately 50-100 cm down. Recently it was found down 55 cm near the Duffey Lake Road, and produced moderate sudden results. This remains a concern in the region because of it's potential for very large avalanches. Cornices are now large and mature and may collapse with daytime warming and intense sunshine.

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