Bollettino valanghe

Northwest Inland

Apr 12 – 13, 2013Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–4
    Fresh thin wind slabs are lurking immediately downwind of ridge crests and exposed terrain features. They are susceptible to human triggering in steep terrain and heavy loading may cause natural avalanches.

Confidence

Poor - Due to limited field observations

Weather Forecast

Saturday: Expect a significant drying trend. Mixed skies, with a slight chance of flurries, alpine temperatures reaching -6 and light easterly winds.Sunday/Monday: Isolated clouds with sunny breaks, alpine temperatures reaching -8 in the afternoons and winds remaining light from the southeast.

Avalanche Summary

No new information from the region. Reports from Wednesday include evidence of Tuesday's natural avalanche cycle with wind slab avalanches up to Size 2.5 failing within the storm snow on steep terrain features. One Size 3 cornice-triggered persistent slab avalanche stepped down to the surface hoar buried a month ago.

Snowpack Summary

15-35cm of recent snow is generally bonding well to the previous snow surface, which includes a crust, facets and/or surface hoar. Strong westerly winds created widespread hard and soft wind slabs in exposed areas, which are reactive to human triggers on steep wind-loaded rolls. Below treeline, the surface snow is undergoing daily melt-freeze cycles with the upper metre of snow becoming wet and losing cohesion by mid-afternoon. Concerns remain for a patchy persistent weakness buried a month ago, and deeper in the snowpack, basal facets may become a concern with continued mild temperatures. Cornices are well-developed and could easily become unstable during periods of warm weather or direct solar radiation.

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