Bulletin d’avalanche

Purcells

Mar 10 – 11, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré

Points saillants

Buried weak layers remain the primary concern, capable of producing large avalanches.

Evaluate terrain carefully and minimize exposure to high-consequence slopes.

Problèmes avalancheux

  • Wind Slabs

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

    Winds have picked up and loose snow is available to build fresh and reactive wind slabs. Small wind slabs could step down to deeper weak layers producing very large avalanches.

Confidence

Moderate

Snowpack Summary

Surface conditions currently include sun crusts on south facing slopes, lightly wind-affected snow, and settling snow.

A widespread crust that formed in early February is roughly 80-120 cm deep. Weak faceted crystals and surface hoar above this crust are contributing to large avalanches across the province.

Additionally, the lower snowpack is mostly made up of weak and faceted layers.

Avalanche Summary

On Friday several size 2 persistent slabs were reported, both natural and human triggered - remotely from 100 m away, indicating weak layers remain sensitive.

Natural and explosive-triggered persistent slab avalanches have been reported (size 2 to 3.5) this week. While fewer human triggered avalanches have been reported, if triggered a large and destructive avalanche remains likely as shown by this remotely triggered avalanche near Golden on Thursday.

Weather Summary

Saturday Night

Increasing cloud. 20-40 km/h south ridgetop wind. Freezing levels rise drop to 800 m. Isolated flurries possible overnight.

Sunday

Mostly cloudy with 1-5 cm of snow. 20-40 km/h southwest ridgetop wind. Freezing levels rise to 1500 m by the afternoon. Treeline temperature -4 °C.

Monday

Mostly cloudy with flurries. 20-30 km/h southwest ridgetop wind. Freezing levels rise to 1500 m by the afternoon. Treeline temperature -4 °C.

Tuesday

Mostly cloudy. 10 km/h south ridgetop wind. Freezing levels rise to 1500 m by the afternoon. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Conservative terrain selection is critical, choose only well supported, low consequence lines.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Be aware of the potential for large, destructive avalanches due to the presence of deeply buried weak layers.

Régions couvertes