Bollettino valanghe

Kananaskis

Dec 13 – 14, 2016Alberta Parks
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Archiviato · scaduto 10 years ago

Pericolo valanghe

Wed
Thu
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

This cold snap/drought is making the snowpack more and more complex. Approach terrain with a critical eye and thoroughly inspect the snowpack as you travel.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    These slabs are on the surface at treeline. In the alpine we are finding 2 separate slabs. 1 on the surface and 1 buried by 15-20cm.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    What was known as the Nov 24th is now lumped into the Nov 12th crust. The reason is we expect any avalanche to scrub down to the crust surface. Note today's avalanche observations as a preview of what is coming. Exposed areas at treeline are suspect.

Confidence

High -

Weather Forecast

Sunny with no precip. An alpine high of -13 with light west winds.

Avalanche Summary

A size 1.5 natural slab avalanche was noted on Mt Buller. N aspect, alpine start zone. It entrained most of the snowpack on its way down.

Snowpack Summary

Two words: Complex and Variable!! Below treeline the snowpack is shallow and weak. Treeline is where the whole thing gets interesting. The Nov 12th crust is down 60cm and is starting to break down with a fine layer of facets immediately above and below. On top of these new facets, there is a 15cm thick layer of facets that have been growing throughout the cold snap. This thick layer was known as the Nov 24th persistent layer-despite being 15cm thick. To make it more complex, the recent winds have now created a windslab that is on the surface (at treeline). Its thought that the Nov 24th layer will instantly step down to the crust surface if initiated.Now for the alpine...take the treeline story and add yet another windslab to the surface. Working surface down, that leaves us with a surface windslab, followed by a buried windslab, followed by the 15cm thick facet layer...then the Nov 12 crust. Better read that a few times...

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