Bulletin d’avalanche

Coquihalla

Mar 5 – 6, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Thu
Fri
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Points saillants

Danger may reach HIGH on sun affected slopes. Sun can rapidly increase avalanche danger and may produce natural avalanche activity.

Stick to low-angle and supported terrain features

Problèmes avalancheux

  • Wind Slabs

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

    Larger and more reactive slabs sit on north and east facing slopes near ridges.

  • Persistent Slabs

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

    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.

Confidence

Moderate

Avalanche Summary

A MIN report from Saturday in the Coquihalla shows reactive conditions remain, with avalanches noted on unsupported features, likely remotely triggered.

Professionals remain concerned about the weak layers and are very cautious about stepping into avalanche terrain.

Snowpack Summary

Recent storm snow is beginning to settle. However, reports show this storm snow is still not bonding well to the weak layers within the snowpack. This includes a crust/facet/surface hoar layer buried 60-100 cm deep, and a widespread crust with weak facets above buried up to 130 cm deep.

Strong sunshine is expected to create moist or wet snow on south facing slopes and increase the reactivity of weak layers.

Weather Summary

Monday Night

Mostly cloudy with no snowfall expected. 20-30 km/h southwest winds. Freezing level at valley bottom.

Tuesday

Clear skies and sunny. 20-30 km/h west winds. Treeline temperature -4 °C. Freezing levels around 800 m.

Wednesday

Mostly sunny with some cloud. 10-20 km/h northwest winds. Treeline temperature -5 °C. Freezing level around 700 m.

Thursday

Mostly sunny.. 10-20 km/h northwest winds. Treeline temperature -2 °C. Freezing level around 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid being on or under sun exposed slopes.
  • Minimize exposure to steep, sun exposed slopes, especially when the solar radiation is strong.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.

Régions couvertes