Boletín de aludes

Banff Yoho Kootenay

Dec 7 – 8, 2019Parks Canada
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Archivado · caducó 7 years ago

Peligro de aludes

Sun
Mon
Alta montaña
4 · Fuerte
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

As the snow continues to fall, the weak faceted snowpack has reached threshold in many areas. Avoid exposure to avalanche terrain and allow the snowpack time to adjust (avalanche) to the new load.

Problemas de aludes

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–1.5

    40-50cm of new snow has fallen, sloughing is a concern in steep terrain and gully features

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1.5–2.5

    40-50cm of recent storm snow accompanied by strong SW winds have formed storm slab. Expect an increase in the size and reactivity of these as we receive more snow and wind over the next 24 hours.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3

    The snowpack structure under the new snow is weak, consisting of facets and depth hoar. If an avalanche is triggered it has potential to scrub down to deeper layers.

Weather Forecast

The storm continues, bringing another 5-15cm by Saturday night (less snow expected along the Eastern slopes). Winds will peak Saturday morning with gusts up to 60km/hr from the SW, then gradually tapering off as a cooler air system moves in.  Expect an alpine high of -8 for Saturday and cooler on Sunday.

Snowpack Summary

40-50cm of new snow has fallen with moderate to strong SW winds, a storm slab is building in the Alpine down to Treeline. Below the storm slab, the snowpack structure is generally weak, consisting of facets and depth hoar. The Nov crust is up to 2400m and ~30cm up from ground. Snowpack depths at treeline are 80-130cm and deeper in lee areas.

Avalanche Summary

Numerous avalanches up to size 2.5 over the last 48 hours as the storm continues. These have been primarily wind/storm slabs in the new snow with isolated avalanches scrubbing deeper into the facets. Explosive control at the local ski areas has produced results up to Sz 2.0 in wind loaded areas.

Poor visibility today limiting observations.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

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