Bulletin d’avalanche

South Coast

Apr 2 – 3, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Avalanche hazard will likely increase throughout the day, be sure your plans allow for a safe retreat from the mountains.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    New snow accompanied by strong wind should result in new slabs being formed on top of surface hoar and crusts by mid afternoon. I expect these touchy slabs will become more and more problematic as the day goes on.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–7
    Three buried weak layers exist in the snowpack. These weak layers could be activated by cornice fall, a smaller surface avalanche in motion, or a rider finding the sweet spot, which would be most likely in steep rocky terrain.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Synopsis: The front breaks down Wednesday night opening the door to zonal flow. A series of weak disturbances should deliver daily precipitation through the weekend.Thursday: Freezing Level: 1000m - 1700m; Precipitation: 1:6mm - 1:10cm; Wind: Treeline: Light, S | Ridgetop: Strong, SWThursday Night: Precipitation: 1:8mm - 1:15cmFriday: Freezing Level: 1100m - 1700m; Precipitation: 1:5mm - 1:10cm; Wind: Treeline: Moderate, SW | Ridgetop: Strong, SWFriday Night: Precipitation: 1:5mm - 1:10cmSaturday: Freezing Level: 1300m - 1900m; Precipitation: 1:6mm - 1:10cm; Wind: Treeline: Light, SW | Ridgetop: Strong, SW

Avalanche Summary

Natural avalanches ran to size 2.5 on solar aspects Tuesday in the form of small loose sluffs and bigger slabs, 20 - 30 cm in depth.In the neighboring Sea to Sky region warming temps induced cornice fall Tuesday. A notable event occurred on a NE facing slope at 2100m when a falling chunk of cornice triggered a small slab immediately below the ridge. The avalanche in motion stepped down to what was likely the late March crust resulting in a size 2.5 avalanche.

Snowpack Summary

The snow surface is a mix of surface hoar and melt freeze crusts.Recent warm temperatures have helped to settle and strengthen the upper snowpack. Down 30 - 50 cm below the surface, snowpack tests are still producing results on the late March crust.The persistent weak layers from early March and early February continue to be a concern. The March melt-freeze crust/surface hoar is reported to be down 60 - 100cm. The February crust/facet/surface hoar layer is now deeply buried down 150 - 250cm.The lower snowpack is strong and well settled.

Régions couvertes