Boletín de aludes

Kootenay Boundary

Feb 26 – 27, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Thu
Fri
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–6
    The presence of weak layers buried in the upper snowpack means there is a risk of triggering surprisingly large slabs.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–4
    Recent snow and wind have created new slabs, which may be particularly touchy on slopes in the lee of the wind.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Friday

Weather Forecast

Wednesday: Possible sunny breaks with isolated flurries, winds moderate from the west and alpine temperatures -8. Freezing level rising to 1000m.Thursday: Light snow, winds light from the southwest and alpine temperatures of -6. Freezing level rising to 1400m.Friday: Light snow throughout the day, light southwesterly winds and alpine temperatures -1. Freezing level rising to 1400.

Avalanche Summary

Recent reports indicate ski cuts, skier remote and natural loose snow avalanches to size 1.5 isolated to the storm snow.

Snowpack Summary

In much of the region, up to 65 cm recent snow overlies weak interfaces buried in mid-February (mainly surface hoar/ sun crust layers). The storm slab above these interfaces has the potential for wide propagations and surprisingly large avalanches, especially where winds have shifted the snow into slabs in the lee of terrain breaks. A thin freezing rain/rime crust formed on Friday, which is now buried by about 15-30cm snow. In the Rossland Range, surface hoar which was buried mid-week is 20-30 cm down and exhibits easy, sudden results in snowpack tests. As more snow builds over this layer, it could become touchy.Older snowpack weaknesses buried in the upper snowpack (Feb 4th and Jan 23 surface hoar/facet/sun crust layers) are still being tracked by professionals. There is some potential for triggering one of these deeper layers with a large trigger like an avalanche in motion, or from a thin-spot trigger point. The lower snowpack is generally well settled.

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