Bulletin d’avalanche

Coquihalla

Mar 4 – 5, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

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

Points saillants

Continue to choose low-angle and supported terrain features.

Watch for strong sunshine, even brief periods can rapidly increase avalanche danger and produce natural avalanches.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    Buried weak layers are most concerning at treeline elevations. Small avalanches may step down to this layer resulting in very large, destructive avalanches.

    Use low-angle, simple terrain to help manage this problem.

  • Storm Slabs

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

    Larger and more reactive slabs sit on north and east facing slopes near ridges. Continue to minimize your exposure to avalanche terrain and watch for signs of instability.

    Danger will rise quickly if the sun appears.

Confidence

Moderate

Avalanche Summary

Observations are currently limited and conditions appear to be improving, however we expect rider triggering is still likely.

A rider triggered avalanche was reported on the MIN on Saturday.

Snowpack Summary

Storm totals of up to 90 cm are beginning to settle, with wind effect in exposed, high terrain. This sits over wind-affected surfaces and 30 to 60 cm of settling snow in sheltered areas. In some areas, sunshine has created heavy snow or a surface crust.

Multiple weak layers exist in the mid-snowpack. The first, a layer of a crust, facets and/or surface hoar is buried around 100 cm deep. The second, a widespread crust with facets above is buried around 130 cm deep. These layers will need time to adjust to the new snow load.

This layer continues to show sensitivity to human triggers, and will take time to begin to settle and bond.

Weather Summary

Sunday Night

Cloudy with 5 cm of snow. 20-40 km/h southwest winds. Freezing level drops to valley bottom.

Monday

Mostly cloudy with isolated flurries. 20-30 km/h southwest winds. Treeline temperature -7 °C. Freezing level around 700 m.

Tuesday

Mostly sunny with some cloud. 30-50 km/h northwest winds. Treeline temperature -9 °C. Freezing levels around 500 m.

Wednesday

Mostly sunny with some cloud. 10-20 km/h northwest winds. Treeline temperature -7 °C. Freezing level around 700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid being on or under sun exposed slopes.
  • Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.

Régions couvertes