Boletín de aludes

South Rockies

Jan 17 – 18, 2012Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

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

Conditions are extremely variable across the region.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–4
    New wind slabs are likely to form quickly as the the wind picks up again, due to the amount of available loose snow.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–6
    A buried surface hoar layer in the top metre of the snowpack continues to be a concern. Although it has become stubborn to trigger, the consequences are high. It's most likely to be triggered from shallow rocky areas on a slope.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–4
    A lot of very dry, loose snow has built up. This has shown the ability to run fast and far, picking up considerable mass as it travels.

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

Wednesday: Cloudy with a few snowflakes. Cold (around -18C). Moderate to strong westerly winds. Freezing level valley floor.Thursday: Light snow possible at times. Remaining cold. Friday: The next frontal system is due to hit the region late in the day, bringing moderate-heavy snow, rising temperatures and gusty winds. Freezing level climbing near 1500m by the evening. The timing of this system is uncertain.

Avalanche Summary

Natural avalanche activity was likely to have peaked during the most rapid loading on Tuesday. Fast-running loose snow avalanches were reported. Observations have been limited by poor travel conditions.

Snowpack Summary

Intense snowfall which started on Monday night and persisted through Tuesday, with rates of 5-7cm/hr observed, was centred on the Lizard Range. In the South Rockies region, the Flathead and southern Elk Valley received the most snow (around 30cm), with lesser amounts further east and north. The snow was exceptionally light and dry and has shown little slab properties, but is running easily as fast-moving sluffs. It came with no wind at Castle Mountain and mainly light winds in other parts of the region. Below the storm snow, older wind slabs appear to be well bonded. Expect new wind slabs to develop if the wind rises.Besides new storm/wind-related concerns, the main layer we're watching in the region is a surface hoar layer buried in early December. It's down about 1m in the Flathead and recently exhibited hard, sudden planar/full propagation results, meaning that's it was stubborn to trigger but could create a large avalanche. Facets sandwiched between two firm layers in the top metre of the snowpack are being monitored in the south-east.

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