Boletín de aludes

Sea To Sky

Feb 16, 2018Avalanche Canada
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Archivado · caducó 9 years ago

Peligro de aludes

Sat
Sun
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Wind slabs at higher elevations continue to be the main concern. Approach steep features cautiously.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Watch for fresh wind slabs forming at higher elevations. Also be suspicious of steep features that may have been previously wind loaded.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2.5
    Large, looming cornices have formed along ridgelines. They need to be given an extra wide berth from above and below. A large cornice collapse in the wrong location may have the ability to trigger a large avalanche on the slope below.

Weather Forecast

FRIDAY: Trace to 5 cm of new snow by the morning then clearing throughout the day, moderate west wind, freezing level climbing to 1000 m with alpine high temperatures around -5 C.SATURDAY: Moderate snowfall with 15-25 cm throughout the day, strong southwest wind, freezing level up to 800 m with alpine high temperatures around -5 C.SUNDAY: Clearing and cooling with strong northeast wind and alpine high temperatures around -14 C.

Confidence

High - on Friday

Avalanche Summary

No new avalanches have been reported on Thursday (as of 4 pm). On Wednesday, a few small isolated size 1 storm slabs were reactive to skiers and few large (size 2-2.5) natural slab avalanches were reported in steep rocky terrain and lee features. Cornices were reactive to explosive triggers, some producing small slabs on the slopes below.Several large cornices have collapsed over the past week. One resulted in a fatal accident in the Callaghan area on Saturday. A snowmobiler was parked 7-10 m back from the edge of a corniced ridge when a large chuck broke off and took the rider down the slope. See here for a full report. A similar incident occurred nearby the same day, but the person only suffered minor injuries. A collapsing cornice also triggered a large slab (size 3) on a north-facing slope west of Pemberton on the weekend. Fragile cornices continue to be a concern in the region.

Snowpack Summary

10-20 cm of light snow sits above a variety of old surfaces, including scoured crusty surfaces on south-facing alpine slopes, a melt-freeze crust up to about 1900 m, and old wind slabs on a range of aspects at high elevations. The mid-January crust is now buried beneath 150-200 cm of settled snow, but a heavy trigger such as a cornice fall could potentially wake up this layer. The lower snowpack is generally strong and well-settled.

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