Bulletin d’avalanche

Purcells

Mar 18 – 19, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Avoid steep, rocky, wind affected terrain where triggering persistent slab avalanches is most likely.

Small avalanches in motion may trigger these deeper layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    30-50 cm of recent snow and southwest wind formed wind slabs on lee slopes at treeline and above

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3

    Triggering is most likely in wind affected terrain on northerly and easterly aspects. Small avalanches in motion may trigger these deeper layers creating very large and destructive avalanches.

  • Loose Wet

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

    Wet loose avalanches will become very likely when the sun comes out. Avoid overhead hazard from steep sunny slopes when the solar radiation is strong.

Confidence

Moderate

Avalanche Summary

On Monday, a naturally triggered size 3 persistent slab was reported on a east facing alpine bowl near Panorama.

On Sunday, a skier remotely triggered a size 2 persistent slab avalanche from 50 m away. The avalanche failed on a wind loaded slope on a northerly aspect at treeline near Panorama. The weak layer was 40-150cm deep.

Snowpack Summary

30 - 50 cm of recent storm snow overlies a crust on sunny slopes and lower elevations, and surface hoar or facets on sheltered and shady upper elevations. Southwesterly wind formed slabs on lee features at treeline and above.

Several persistent weak layers consisting of a crust, facets or surface hoar from February and January remain a concern. They are down 50 to 100 cm in most areas.

The bottom of the snowpack is composed of large facets in most areas.

Weather Summary

Tuesday Night

Clear skies, 5 to 10 km/h southwest ridgetop winds, treeline temperature -10 °C, freezing level valley bottom.

Wednesday

Mostly sunny, 5 to 10 km/h southwest ridgetop winds, treeline temperature -4 °C, freezing level 1500 m.

Thursday

Mix of sun and cloud, 10 to 20 km/h southwest ridgetop winds, treeline temperature -3 °C, freezing level 1600 m.

Friday

Mostly cloudy with isolated flurries, 3-5 cm snow, 20 to 30 km/h southwest ridgetop winds, treeline temperature -3 °C, freezing level 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Even brief periods of direct sun could produce natural avalanches.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

Régions couvertes