Bollettino valanghe

South Rockies

Dec 20 – 21, 2013Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

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

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    Mostly S and SW winds continue to develop wind slabs in the alpine and open areas at treeline.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–4
    The most significant interface is a layer of surface hoar from early December. This is buried 30-70 cm below the surface and is becoming more reactive in areas where the upper slab has become a little denser.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Very little precipitation in the forecast for this region. Saturday, Sunday, Monday: A chance of flurries each day, with light snow possibly starting to fall Monday afternoon. Treeline temperatures consistent around -10C. Ridgetop winds moderate from the NW, picking up a little on Monday afternoon.

Avalanche Summary

A few loose dry sluffs were observed on Friday. No Slab avalanches were reported.

Snowpack Summary

There appears to be a lot of snowpack variability across the region. Snowpack depths at treeline seem to vary from 50 - 110 cm with high variability in wind-exposed areas. There are several persistent weak layers which are still being discussed in the region. Nearest to the surface is the mid-December (~Dec 10) facet/surface hoar/crust interface which does not seem to have enough snow on it yet to create a widespread problem. Next is the late-November/early-December interface which is made up of surface hoar, a crust, and/or facets. This layer is typically down 30-70cm and is most likely to pose the biggest problem for the region at the moment. Check out this video of a recent snowpack test on this layer. Despite it's reactivity in snowpack tests, we have not yet seen widespread avalanche activity on this layer. I suspect it only needs a little more additional load to turn this into a more serious avalanche problem. A buried crust from mid-November can be found near the base of the snowpack below 1650 m and is breaking down into facets.

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