Boletín de aludes

South Rockies

Mar 9, 2017Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Thu
Fri
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

The best and safest riding will likely be found in sheltered, lower elevation terrain.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    Gusty southwest winds at upper elevations have formed fresh wind slabs on leeward slopes and behind terrain features. Watch for conditions that change with elevation.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–4
    A weak layer near the base of the snowpack has the potential for large avalanches, especially in areas with minimal rider compaction or thin variable snow cover.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Thursday: 2-4cm of new snow / Light southwest winds / Alpine temperature of -10Thursday night and Friday: up to 15cm of new snow / Strong to extreme southwest winds / Alpine temperature of -7Saturday: Mix of sun and cloud / Moderate southwest winds / Alpine temperature of -3 / Freezing level at 1500m

Avalanche Summary

On Monday, explosive control and ski cutting produced size 1-1.5 avalanches at treeline and in the alpine. A cornice fall in Waterton Park resulted in a Size 2.5, entraining lots of snow. Natural activity is expected to taper off, but storm and wind slabs will remain susceptible to human triggering.

Snowpack Summary

We've had daily snowfalls of 5-15cm since Saturday, bringing the total from the past week to 50-80 cm. At times, strong southwesterly winds redistributed the new snow onto leeward slopes, building thicker and stiffer slabs. The new snow will likely have a poor bond to the old snow interface that consists of stiff wind slabs, crusts, and facets.The mid-pack in this region is generally strong, but the bottom third of the snowpack is composed of weak facets (sugary snow crystals). Approximately 100-120 cm of settled snow sits above this weak layer of sugary, rotten facets that developed in December. This remains a concern and should be on your radar, especially with the recent loading from snow and wind.

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