Bulletin d’avalanche

Kananaskis

Dec 7 – 8, 2020Avalanche Canada
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Archivé · expiré 6 years ago

Danger d’avalanche

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

Points saillants

Expect to see some snow on Tuesday along with westerly winds.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5

    A fresh layer of wind slab is expected to build overtop of the previous hard windslabs, which are widespread in alpine areas and even down into treeline. Listen for that drummy or hollow feel as an indication to be extra careful.    

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    The November crust continues to be the main concern in the snowpack. Any avalanche in the upper snowpack will likely scrub down to these layers

Confidence

Moderate -

Weather Forecast

Finally, I can use the "SNOW" word. Flurries are expected to start in the early hours of Tuesday morning with 10-15cm expected by evening. Let's wait and see which weather model holds true. Winds are expected to be strong SW Tuesday morning and moderate in the afternoon. Expect a high of -5c in the Alpine.  

Avalanche Summary

No new avalanche activity observed or reported.

Snowpack Summary

If the amount of snow is more than forecast or comes earlier with the winds, be mindful of fresh wind slabs.

Alpine areas have been heavily affected by the past week of strong winds and hard wind slabs are widespread at tree line and above. Ridges and ribs have been previously stripped free of snow while lee and cross-loaded terrain have deep deposits of previous wind loaded snow. The November crust is down 30-100cm and is still producing anywhere from moderate to no results. Faceting has started near the Nov. crust and is something that will be followed closely as more load gets deposited. Alpine temperatures reached near +2c on Monday. Expect some surface crusts from this warming event or from last week's warming, especially on solar aspects.

Terrain and Travel

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • Approach lee and cross-loaded slopes with caution.
  • Watch for areas of hard wind slab on alpine features.

Régions couvertes