Bulletin d’avalanche

Kootenay Boundary

Dec 4 – 5, 2024Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Exercise caution in steep, wind-affected terrain.

Warm daytime temperatures require extra caution on steep, sun-exposed slopes.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5

    Recent westerly winds may have formed wind slabs in leeward terrain features adjacent to ridges.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Use caution when travelling on steep south aspect terrain where even a small avalanche can have consequence when combined with terrain traps such as cliffs.

Avalanche Summary

On Tuesday warming temperatures in the PM initiated small (size 1) loose wet avalanche on steep south facing terrain. Last week explosives testing triggered several small and large (size 1 to 2) slabs, mostly on south and southwest aspects. Old storm snow is generally well-bonded, except possibly in areas with recent wind loading.

Confidence

Moderate

Snowpack Summary

Surface hoar has developed in many areas, while steep, south-facing slopes are warming during the day and forming a thin crust as temperatures drop. In sheltered zones, the upper 40–70 cm of snow remains soft, though wind exposure has redistributed snow in open terrain.

The snowpack is well-settled, dense, and generally strong, with a buried surface hoar layer found 60 to 80 cm below the surface.

Treeline snow depths range from 100 to 150 cm.

Weather Summary

Tuesday Night

Mainly clear. 10 to 15 km/h northwest ridge top wind. Treeline temperature 0 °C

Wednesday

Mainly clear. 5 to 10 km/h southwest ridge top winds. Treeline temperature 1 °C.

Thursday

A mix of sun and cloud. 10 to 15 km/h southwest ridge top wind. Treeline temperature 1 °C.

Friday

A mix of sun and cloud. 15 to 25 km/h southwest ridge top wind. Treeline temperature 1 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.

Régions couvertes