Bulletin d’avalanche

Purcells

Mar 8 – 9, 2013Avalanche Canada
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Archivé · expiré 14 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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–5
    The soft slabs located below ridge tops and in open areas could become weaker especially on S facing slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–6
    Persistent weak layers exist buried down 60-90 cm, comprising of surface hoar and a sun crust. A cornice fall could definitely trigger this layer..

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Forecasted solar radiation and warmer temperatures will weaken the surface of the snow creating loose moist/wet avalanches.

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain on Sunday

Weather Forecast

Friday night and Saturday:  The dominating feature is a ridge of high pressure over the whole province bringing warmer air (-4 in the alpine), freezing levels rising to 1600 m., clear skies and light NW winds. Sunday: The ridge is breaking down in the North and remains in the Southern part of the interior range. There is a chance of light precipitation for Sunday (5-10 mm) with winds picking up in the moderate range from the W. Temperatures are slightly cooler than Saturday.Monday: Another system which could deliver more precipitation is expected for Monday but the timing and intensity is still uncertain.

Avalanche Summary

Several natural and skier triggered loose dry avalanches size 1 were reported which ran in the new snow in steep rocky terrain.

Snowpack Summary

The solar radiation and temperatures increasing tomorrow (especially in the Southern part of the region) will weaken the surface of the snowpack especially on S facing slopes. This could possibly trigger the recent wind slabs in the alpine lee areas and below lee ridgetop at treeline. Large looming cornices exist on ridgelines and could also be triggered by the warmth and sun creating a significant load on the slopes below. Buried beneath (60-90 cm) exists a surface hoar and a sun crust layer, which continue to be lingering concerns. A cornice fall could trigger this deeper instability potentially creating large avalanches.

Régions couvertes