Bulletin d’avalanche

Northwest Inland

Mar 1 – 2, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Considerable danger remains for alpine areas in high snow areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Strong winds throughout the region have set up touchy wind slabs in the lee of ridges and terrain features. Watch also for growing cornices.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–4
    Storm slabs remain in the west and the south of the region where there were deeper recent snow amounts. In particular, watch areas where snow overlies a crust at treeline and below.

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: A benign weather pattern will bring initially flurries and then clearer skies for the region through the forecast period.Saturday: Flurries. Southwesterly ridgetop winds to 30 km/h. Freezing level around 600 m.Sunday: Clearing through the day. Light northwesterly winds. Freezing level around 600 m.Monday: Clear with some good sunshine. Light southeasterly winds. Freezing level around 600 m.

Avalanche Summary

Small (size 1) soft slab avalanches could be triggered in response to ski-cutting at treeline on north aspect slopes through the whole week. On Thursday, a size 1.5 avalanche was human-triggered below treeline on a north aspect running on a melt-freeze crust.

Snowpack Summary

Recent storm snow amounts are 30-40 cm in the west of the region and more like 10 cm in the east. Strong southwest winds have formed touchy wind slabs in exposed terrain in the lee of ridges, gully side walls, and behind terrain features. There are a variety of old interfaces now down 60 - 100cm which include facets, crusts and isolated pockets of surface hoar. Recent observations indicate that these weaknesses have bonded fairly well now, but I still suggest digging and testing the snowpack to confirm.A strong mid-pack currently overlies a weak base layer of facets/depth hoar. It is worth noting that the snowpack in general is quite shallow in northern and eastern parts of the region. Triggering the basal weakness may still be possible from thin spots, rocky outcrops or under the weight of larger triggers such as cornice fall.

Régions couvertes