Bulletin d’avalanche

Purcells

Feb 24 – 25, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Significant snowpack and weather variations exist throughout the region. Be aware of conditions that are specific to your area and make observations continuously as you travel.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    Loading from new snow and wind may add reactivity to persistent buried surface hoar layers. In deeper snowfall areas, resulting avalanches may be surprisingly large.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Continued snowfall is forecast for Sunday night. Where higher accumulations exist, continued storm slab activity will be very likely, especially in wind-affected areas. In sheltered terrain the new snow may react as a loose dry avalanche.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Sunday night and Monday: Light to locally moderate snowfall becoming light on Monday / Strong west winds becoming light northwesterly on Monday / Freezing level at 1100mTuesday: Mix of sun and cloud / Light southwest winds / Freezing level at 1200mWednesday: Very light snowfall / Light southwest winds / Freezing level at 900m

Avalanche Summary

Widespread avalanche activity took place in response to Friday's system. Loose dry and storm slab avalanches to size 2.5 were reported from the region. Continued avalanche activity is anticipated with weather forecast for Sunday night.

Snowpack Summary

On Friday light to locally heavy amounts of snow fell. The new snow was distributed into deeper wind slabs by locally strong winds, particularly on the west side of the region where accumulations have been highest. These new accumulations are adding load to the variably reactive February 12th and 15th surface hoar layers which now exist up to 80cm below the surface. The slab may also be reactive on southerly aspects where buried sun crusts exist. A surface hoar layer buried on February 23 is still on the radar of some operators. This layer has been less likely to trigger by skiers, but may still be sensitive to large loads like avalanches in motion or cornice fall. The mid and lower snowpack are generally well settled and strong.

Régions couvertes