Boletín de aludes

South Rockies

Dec 19 – 20, 2019Avalanche Canada
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Archivado · caducó 7 years ago

Peligro de aludes

Sat
Sun
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Triggering an avalanche is most likely in wind affected terrain and steep, rocky slopes.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    Wind has redistributed recent snow, scouring exposed slopes and forming wind slabs around lee features.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1.5–2.5

    The likelihood of triggering a large avalanche on one of the crusts and weak layers in the lower snowpack is gradually reducing, but the consequence of doing so is high.

Avalanche Summary

Explosives triggered 2 small (size 1) wind slabs on Wednesday. A few small (size 1) natural avalanches were noted around the Castle area on Tuesday and skiers reported fresh wind slabs cracking underfoot.

Weather Forecast

Wednesday Night: Mostly cloudy. Alpine temperature -10 C. Southwest wind 25-35 km/hr.

Thursday: Flurries, trace to 5 cm. Alpine temperature -6 C. Southwest wind 20-35 km/hr.

Friday: Snow, heavy at times 20-30 cm. Alpine temperature -3 C. Southwest wind 20-40 gusting to 80 km/hr. Freezing level rising to 1900 m.

Saturday: Continued flurries, 5-15 cm. Alpine temperature -2 C. Southwest wind 30 gusting to 75 km/hr. Freezing level 1600 m.

Confidence

No Rating - Uncertainty is due to the limited number of field observations.

Snowpack Summary

Wind has scoured exposed terrain and formed wind slabs in the alpine, and around lee features and lower into start zones.

The bottom half of the snowpack consists of crusts from November and October and basal facets. These persistent weak layers produced large avalanches over a week ago but have since gained strength. Overall, a shallow and variable snowpack is found around the region. Snowpack depths range between 50-100 cm around treeline and taper rapidly below.

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