Boletín de aludes

Kootenay Boundary

Feb 4, 2017Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Sat
Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado

Lo esencial

New snow and wind will likely build reactive storm slabs. Storm slabs may have the potential to trigger deeper weakness in shallow snowpack areas. Conservative terrain selection is key for the weekend.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2
    Reactive storm slabs will likely have a poor bond to the variety of old snow surfaces.
  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3
    Additional loading from new storm snow and wind may have enough mass to overload the weaker facets that exist mid-pack and/ or deeper in the snowpack. If reached critical load, the potential for full depth avalanches

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

The weather pattern has finally shifted as a surface low moves onto the Interior bringing new snow through the weekend. Saturday: Snow amounts 10-20 cm with light- gusting strong southwest winds. Alpine temperatures near -4 and freezing levels 1200 m. Sunday: Snow amounts up to 20 cm with strong southwest winds. Alpine temperatures -3 and freezing levels 1300 m.Monday: Snow accumulations up to 20 cm with light southwest winds. Alpine temperatures near -3.

Avalanche Summary

No new avalanche observations were reported on Thursday. New building storm slabs will likely have a poor bond to the old snow surfaces and be reactive through the weekend, potentially stepping down and initiating deep persistent slabs.

Snowpack Summary

New snow has buried a variety of old snow surfaces including stiff wind slab or wind effected snow at upper elevations, sun crust on steep southerly slopes and surface hoar in sheltered areas. Below the surface, 50-65 cm of settled snow now sits above an interface that was buried in mid-January. The interface is composed of weak facets, surface hoar, and/or sun crusts and the strength of the bond is reportedly variable. Recent snowpack tests have shown sudden results on that interface. Areas with a shallower snowpack (less than 150 cm) have a generally weak snowpack structure with sugary facets near the ground. This includes shallow alpine slopes and most of the Rossland range. These deeper weaknesses warrant monitoring and create a complicating picture. It may be a low probability that you would trigger an avalanche that failed on these basal facets, however; the consequences could be detrimental. These layers may be unreactive but they could reawaken with more snow load.

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