Boletín de aludes

South Coast

Apr 8 – 9, 2016Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Sun
Mon
Alta montaña
Sin grado
Límite del bosque
Sin grado
Bajo el límite
Sin grado
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Lo esencial

Spring conditions typically means the hazard is highest during the heat of the afternoon. Cornices and loose wet sluffing are spring problems which can be expected on Saturday. Deep persistent avalanches may become possible with sustained warming.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–5
    Large cornices may become weak with afternoon warming and sun exposure. They can be destructive by themselves, and may also become the trigger for a slab avalanche on the slope below.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–3
    Loose wet sluffing is likely on sun exposed slopes during the heat of the afternoon. Very warm conditions may increase the size and run length of natural sluffing, and wet slabs could also be possible.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    3–6
    There is concern that a buried weak layer may wake-up with the warming this weekend in the northern half of the region. Very large avalanche may be possible in isolated areas.

Weather Forecast

The warm ridge of high pressure persists through the weekend. Saturday and Sunday are expected to be sunny with light alpine winds and afternoon freezing levels around 3000m. Unsettled conditions are expected for Monday with a mix of sun and cloud. Moderate southwest winds are expected in the alpine and freezing levels are expected to drop to around 2200m.

Avalanche Summary

On Thursday, explosives triggered two size 3 persistent slab avalanches north of Pemberton on southern aspect slopes at around 2100m elevation. The slabs were 40-50cm thick and were suspected to have failed on a crust from the end of February. Explosives also triggered two size 2.5 wet slab avalanches. Loose wet sluffing up to size 2.5 was also reported.  On Wednesday, natural loose wet avalanches up to size 1.5 were reported. Skiers and explosives were triggering wind slabs up to size 1.5 in leeward features and on steep rolls. A couple point releases triggered slabs up to size 2.5. With warm and sunny conditions continuing, spring avalanche problems are expected to be the primary concerns. Loose wet avalanches and large cornice falls are expected throughout the forecast period. Wet slabs and deeper persistent slab avalanches may be possible while the temperatures remain high and overnight recovery is poor. Lingering wind slabs may also still be a problem on high elevation north aspects.

Snowpack Summary

Little to no overnight recovery was reported on Friday morning leaving a moist or wet snow surface on all aspects and elevations. The early-April crust layer is typically down 10-20cm and is reported to be breaking down due to the warm conditions. Prior to the warming, the recent storm snow had been shifted by strong southerly winds into wind slabs in wind-exposed terrain. These wind slabs may still be lingering in high north facing terrain. There is an old crust layer down about half a meter in the Duffey area and north of Pemberton.  This layer has generally be dormant but resulted in a couple avalanches during the last major warming event and produced a couple explosive triggered avalanches on Thursday.  With continued warming, this layer could wake-up and become a more widespread problem. Cornices are huge and will become weak with warming and solar radiation.

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