Bulletin d’avalanche

Sea To Sky

Apr 6 – 7, 2018Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Snow is forecasted for Saturday with associated strong winds. Be cautious of periods of rapid precipitation or wind loading, as avalanche activity may increase.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5
    Cornices are very large and fragile. Give them a large berth if travelling on ridges and avoid travelling underneath them, as they can trigger large avalanches.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    A weak layer buried 60 to 90 cm is still surprising people and producing large and destructive avalanches. Be particularly cautious around upper treeline and alpine terrain on shady aspects, where this layer is most likely to be a problem.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Recent snowfall has formed new slabs. More snow is forecasted for Saturday, which will build thicker slabs. Observe for the bond of new snow with the old surface before committing into avalanche terrain.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

SATURDAY: Cloudy with snowfall, accumulation 10 to 20 cm, strong southerly winds, alpine temperature -3 C, freezing level 1600 m.SUNDAY: Mostly cloudy with light snowfall, accumulation 2 to 5 cm, light westerly winds, alpine temperature -3 C, freezing level 1600 m.MONDAY: Mostly cloudy, light southwesterly winds, alpine temperature -3 C, freezing level 1600 m.

Avalanche Summary

On Thursday, small loose dry, loose wet, and storm slab avalanches were reactive to skier triggers.On Wednesday, skiers triggered a large persistent slab in alpine terrain. It was reported as a size 3, 50-200 cm deep.

Snowpack Summary

New snow and strong southerly winds are creating new slabs at higher elevations. This snow overlies various old surfaces including previous storm snow, melt freeze crusts on sunny aspects, and old wind slabs. On ridges, cornices are reported to be large and fragile. At lower elevations, precipitation is falling as rain and creating wet snow conditions.A weak layer consisting of surface hoar, facets, or a sun crust from late March is now buried about 60 to 90 cm. This layer is spotty in its distribution but has recently produced large avalanches. It is mostly likely to be problematic on shady aspects between 1900 m and 2250 m.Below this, the snowpack is well-settled and strong.

Régions couvertes