Boletín de aludes

South Rockies

Mar 3 – 4, 2014Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
3 · Notable
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Lo esencial

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Recent strong winds from the north resulted in reverse loading.  Winds are now from the SW and forming new wind slabs.  Expect wind slabs on all aspects in wind affected terrain.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    3–6
    Expect the buried persistent weak layer to continue to produce large and destructive avalanches. Many slopes are still primed for human triggering and remain a concern on all aspects and elevations.

Weather Forecast

A series of weak disturbances will result in light intermittent snowfall during the forecast period. Tuesday: Partially cloudy, scattered flurries 1-3cm, freezing level rising to around 1400m, ridgetop winds 30-50 km/h SWTues. Night/Wednesday: Snowfall 2-8cm, freezing level around 1800m, ridgetop winds 30-50 km/h SW-WThursday: Snowfall 4-10cm, freezing level around 1200m, ridgetop winds 20-40 km/h SW

Avalanche Summary

Reports of loose sluffing from steep, rocky terrain. On Sunday, a size 1.5 skier triggered avalanche was reported. This released down 40cm and it is expected to have failed on the early-Feb persistent weak layer.

Confidence

Fair - Due to the number of field observations

Snowpack Summary

10-20cm of new snowfall overlies surface hoar, facets, and/or a sun crust on south aspects.  Recent moderate to strong SW winds have created wind slabs in leeward and cross-loaded features. Previous wind from the NE created wind slabs which are now buried by new snow but still may be reactive.The primary concern remains a persistent slab that sits on a stubborn persistent weak layer consisting of a crust, facets, and/or surface hoar. The layer continues to show a high degree of sensitivity to human triggers. Wide propagations and remote triggering remain a concern. In the thinner snowpack areas such as the Crowsnest and northern Elk Valley, the slab is typically 30-60cm thick. In thicker areas such as the Flathead and around Fernie, the slab typically varies in thickness from 70-150cm. Check out the South Rockies Blog for a video discussing the persistent weak layer and the current avalanche problem. A weakness at the base of the snowpack may still exist in isolated areas of the region but triggering has become unlikely.

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