Bulletin d’avalanche

Purcells

Mar 17 – 18, 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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    New wind slabs may be encountered behind ridges and ribs.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Cornices are tender and can trigger slabs on slopes below. Give them a wide berth.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–6
    New snowfall is adding to existing storm slab problems. Give the snowpack time to find its equilibrium before considering aggressive terrain.

Snowpack Summary

New snow is adding weight above deep and cohesive storm slabs which formed last week. These older storm slabs are slowly gaining strength, but are not yet fully settled. Winds from the south through to north-west have formed wind slabs and cornices in the lee of ridges and ribs. A recent rain-soaking weakened the low elevation snowpack, which is likely to become very strong once refrozen.Weak interfaces deeper in the snowpack have become unlikely to be triggered. A facet/crust layer sits at the base of the snowpack.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Tuesday

Weather Forecast

Sunday night: Light snow. Light W winds. Alpine temperature near -12.Monday: Light snow (5-10 cm). Light W winds, gusting to strong NW. Alpine temperature near -6.Tuesday: No snow. Sunshine. Light SW winds. Alpine temperature near -11.Wednesday: Light snow (10 cm). Light S winds. Alpine temperatures near -4.

Avalanche Summary

Natural avalanche activity, which was widespread during last week’s storm, began to ease on Saturday. Explosives testing triggered three size 2-3 slabs within the storm snow. A snow cat pushing snow triggered a size 2.5 slab, which ran on a SW aspect just above treeline in the backcountry.

Régions couvertes