Bulletin d’avalanche

South Rockies

Dec 11 – 12, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Seek sheltered terrain and shady aspects for decent riding conditions. Watch for signs of instability if the sun comes out.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Variable winds from last week have formed stiff wind slabs on a wide range of aspects at higher elevations.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Several persistent weak layers exist at the base of the snowpack. Possible trigger spots may be found in shallower inconsistent (thin-thick) snowpack areas or around rocks and trees.

Avalanche Summary

No new avalanche activity has been observed.

Confidence

Low - Due to the number and quality of field observations

Weather Forecast

Tuesday: Mix of sun and cloud. Alpine temperatures near -1 and freezing levers 1200 m. Ridgetop winds light from the west. Alpine temperature inversion exists.Wednesday: Cloudy with sunny periods. Alpine temperatures near -1 and freezing levels 1400 m. Ridgetop winds light from the west. Thursday: Mostly cloudy. Alpine temperatures near 0 degrees and freezing levels 1000 m. Strong alpine temperature inversion expected. Light west winds.Check out the Mountain Weather Forecast for more details.

Snowpack Summary

A variety of snow surfaces exist throughout the region. Stiff wind slabs sit on a wide range of aspects in the alpine and exposed treeline terrain. Windward slopes  have been scoured down to the old rain crust or rock and sun crusts have formed on southerly slopes from the sun and recent warm temperatures. Sheltered treeline and below treeline slopes may have a light dusting of low-density snow that intermingle with surface hoar and surface facets. This is what I call a mixed bag!!The two crusts that were buried near the end of November can now be found approximately 30 cm and 60 cm down. A third crust from the end of October exists as a "facet/crust" combo near the base of the snowpack. Snowpack testing in the adjacent Kananaskis Country forecast region has yielded hard but sudden results on this layer.Average snowpack depths at upper elevations in the region range from about 50-100 cm.

Régions couvertes