Boletín de aludes

South Coast Inland

Feb 12, 2017Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Sun
Mon
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Human triggered avalanches remain likely on Sunday at treeline and above, especially in the Coquihalla. Use small slopes with low consequence to test the bond of the storm snow.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–4
    This problem is more prevalent in the far north areas of the region and is a low likelihood, high consequence scenario that will need to be monitored as snow loads increase.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Continued snow and wind are making the existing storm and wind slabs dangerous.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Seasonal temperatures and isolated flurries through the weekend. Significant alpine warming Tuesday onwards. SUNDAY: Mix of sun and cloud / Light - moderate southwesterly winds / Freezing level around 900 m. MONDAY: Sunny with cloudy periods, warming significantly with highs to +5 Celsius / Moderate southeasterly winds / Freezing level around 1500 m. TUESDAY: Mostly cloudy / High temperatures to +4 Celsius / Light-moderate southwesterly winds/ Freezing level around 2500 m.

Avalanche Summary

A widespread natural avalanche cycle (to Size 2.5) occurred on all aspects and elevations at treeline and above from Thursday into Friday. Spooky conditions with shooting cracks and whoompfing were reported in a great MIN post (see here for details) on Saturday afternoon on Nak Peak (Coquihalla area). Conservative terrain use is essential under these conditions.

Snowpack Summary

An additional 20 + cm of snow fell Friday into Saturday on the Coquihalla with moderate to strong southwest winds; meanwhile, only 4cm fell in the Duffey Lake zone. This new snow added to the 65-80 cm (lower amounts in the north) of recent storm snow. Temperatures rose on Thursday afternoon, increasing the likelihood slab avalanches with the heavier snow on top of lighter, drier snow. All this storm snow is sitting on a wide variety of old snow surfaces including stiff wind slab or wind affected snow at upper elevations, sun crust on steep southerly slopes, surface hoar and surface facets in sheltered locations. The mid-December facets down 130-160 cm still remain a concern especially in shallower snowpack areas in the Duffey, Hurley and/ or South Chilcotins. These deeper weaknesses warrant monitoring, especially through periods of rapid loading. In southern areas (Coquihalla), the lower snowpack is reportedly well settled (stronger), than it is to the north.

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