Bulletin d’avalanche

South Coast

Dec 2 – 3, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Heavy snowfall in the North Shore mountains (60-90cm storm snow) will take time to settle and bond to a crust. Carefully assess the snowpack before venturing into more aggressive terrain.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Recent snow and wind resulted in slab avalanche conditions in steep and/or exposed terrain. Be careful around broad open slopes and steep terrain, especially where you can feel the November 26th crust with your ski pole.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

We'll see a clearing trend on Sunday and fine weather during the week.Sunday: Clearing in the morning and then dry with some sunny breaks. Light northwesterly winds. Freezing levels 800m.Monday: Sunny with cloudy periods. Freezing levels around 400 m. Light northwesterly winds.Tuesday: Mainly sunny and becoming warm up high. Freezing levels rising to 2000 m. Light northerly winds.

Avalanche Summary

Storm slabs were easily triggered by ski cutting on Thursday into Friday. See here for a good video of how easily the snow was moving on Thursday. We also had a fine MIN post describing storm slab activity on Mt SeymourExpect human triggered and natural avalanches to occur in steep, wind-affected terrain at higher elevations while precipitation continues.

Snowpack Summary

Significant amounts of storm snow fell over the past two days, with 50-80 cm of new snow accumulating. That said, the snow appears to be bonding well to a crust (down 70-90cm at treeline elevations) and stabilizing rapidly. During the storms, instabilities have generally been short-lived and limited to layers down 20-30cm in the storm snow, or specific lee (northerly) features which saw rapid loading due to south (east) winds. Travel has improved below treeline, however, there are still open creeks, alder and other early season hazards. Expect snow depths of around 50 cm at 800 m and around 200 cm at 1200 m.

Régions couvertes