Boletín de aludes

South Columbia

Dec 16 – 17, 2021Avalanche Canada
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Archivado · caducó 5 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

 Use extra caution near ridgelines and "thick to thin" areas where the likelihood of triggering avalanches will be greater. The early December layer is starting to produce avalanches that could surprise experienced riders.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1–2

    Isolated wind slab can still be found in exposed treeline and alpine features.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–2.5

    30 to 80cm of snow sits on the early December facet crust combo. a few people have been surprised by this layer over the last week. Use extra caution around "thick to thin" slopes, especially in the upper treeline.

Confidence

Moderate - Uncertainty is due to the fact that persistent slabs are particularly difficult to forecast.

Weather Forecast

Wednesday night: No new snow expected. Wind will be light to moderate from the Southwest. Low of -11 at 1600m.

Thursday: Up to 5cm of new snow with a high of -8 at 1600m. Winds becoming strong from the Northwest in the alpine.

Friday: no new snow expected. Moderate winds from the Northwest shifting to the Southwest. High of -13 at 1600m.

Saturday: a storm arrives bringing up to 15cm of new snow with strong Southwest winds. High of -9 at 1600m.

Avalanche Summary

On Tuesday one skier triggered size 1.5 storm slab was reported on a North aspect at 2200m. This avalanche occurred on the facets above the early December crust. The slab was 35cm thick.

Snowpack Summary

Up to 20cm of low density snow overlies old wind effected surfaces.

The defining feature of the snowpack is a widespread crust that reaches as high as 2400 m and now sits 30-80 cm below the surface. In many places overlying snow is well-bonded to the crust but in others weak faceted grains have been observed growing above it. The faceting is most prominent in the upper treeline where the crust is thinner.

Average snowpack depth at treeline is 200cm.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

Regiones cubiertas