Boletín de aludes

Kananaskis

Feb 21 – 22, 2016Alberta Parks
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Archivado · caducó 11 years ago

Peligro de aludes

Tue
Wed
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
1 · Débil
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Lo esencial

Complex snowpack means making simple terrain choices until these avalanche problems are given some time to resolve themselves.  Cornices are massive at the moment and can easily trigger deeper instabilities causing large and destructive avalanches.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–4
    Any steep terrain with wind slabs overlying sun crusts or melt freeze crusts should be avoided.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–5
    Recent snowpack tests show sudden collapses on the Jan 6th facets and in other locations no results.  Treat large scale alpine slopes with high caution and watch out for cornices that can trigger this layer especially shallow areas.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–3
    South facing terrain with buried sun or melt-freeze crusts should be treated with great skepticism before committing to the line.  Thorough investigation is a requirement if crusts are detected with a ski pole.  Dig down and conduct a snowpack test.

Confidence

High

Weather Forecast

Avalanche Summary

A small to medium cycle was observed today on the Spray Smith Dorrian Highway. Several large avalanches from size 2.5 to size 3 were observed on east through southeast aspects on and below large alpine faces and in some instances running close to the end (3/4 path) of their historical run-outs due to strong to moderate sustained winds yesterday and the week prior. Forecast temperatures and lighter winds will diminish natural avalanche activity.

Snowpack Summary

The snowpack in the alpine has approximately 5cms of low density fluff sitting over wind-pressed and buried wind slabs. On north aspects the bond between the older wind slab interfaces appears to have tightened up in the upper snowpack. The bond at the February 11th melt-freeze & sun-crusts interfaces on southerly aspects has not gained any strength. Recently built wind slabs will also be found at treeline and alpine ridge features on east through south aspects. The cornices high up on alpine ridge top features are immense. Lower elevations at treeline and below will be facetted and lacking structure as a result of shallow heights of snowpack.

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