Boletín de aludes

Northwest Inland

Jan 20, 2017Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

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

Uncertainty about deep persistent slabs warrants a conservative approach to terrain after the storm.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    Recent snow, warming, and strong winds have created a widespread storm slab problem, particularly on wind-loaded features. Storm slab avalanches in motion may step down and trigger deep persistent slab avalanches.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3
    Recent storm snow combined with warming and wind has loaded hard slabs above a weak faceted base. Uncertainty revolves around what type of load is now required to trigger these deep persistent slabs.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

FRIDAY: Cloudy, light southwest winds, freezing level dropping with alpine temperatures around -5 C.SATURDAY: Cloudy with isolated flurries, moderate southeast winds, alpine temperatures around -8 C.SUNDAY: Cloudy with sunny periods, light southeast winds, alpine temperatures around -8 C.

Avalanche Summary

On Wednesday, several loose wet avalanches were reported from steep rocky terrain at lower elevations where rain fell on snow. Storm slabs sitting on a weak layer of surface hoar and/or a crust are likely easy to trigger at higher elevations. Full depth avalanches continue to be a concern due to the weak faceted snowpack below old hard wind slabs. This deep persistent weak layer may take prolonged warm weather with consistent snowfall to settle and bond.

Snowpack Summary

20-25 cm of new storm snow has been transported by southwest winds and now sits on a mix of old surfaces left behind after the recent cold and windy weather. Expect the new storm snow to bond poorly where it is sitting on a weak layer of buried surface hoar and/or a hard old wind polished surface. The freezing level recently reached 1000 m, and below this level the snowpack is likely moist and will eventually form a hard crust. Most areas continue to have a shallow and weak snowpack that is about 120-150 cm at treeline. In general, the snowpack above treeline has been heavily wind effected; this has resulted in hard wind slabs above weak faceted snow.

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