Bulletin d’avalanche

South Coast Inland

Mar 11, 2018Avalanche 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

Points saillants

The freezing level is forecast to rise steadily over the next days, which will destabilize the surface snow in the short term.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5
    New snow combined with predominantly southwest winds have created wind slabs in the lee of terrain features.
  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5
    Sun combined with rising freezing levels will weaken the surface snow on slopes exposed to the sun.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

SUNDAY: Mix of sun and cloud / Light southeast wind / Alpine temperature 4 / Freezing level 2100m  MONDAY: Mix of sun and cloud / Light southeast wind / Alpine temperature 6 / Freezing level 2500m  TUESDAY: Cloudy with flurries or rain showers / light to moderate east wind / Alpine temperature 6 / Freezing level 2500m 

Avalanche Summary

A skier triggered size 2 wind slab avalanche was reported from the north of the region on a northeast aspect in the alpine. Avalanche activity on Friday was reported as either loose dry to size 1 or wind slab activity to size 1-1.5 on northerly aspects at tree line.

Snowpack Summary

New snow accumulating on Thursday and Friday has been redistributed by southerly winds at upper elevations. The new snow sits on a sun crust on steep south-facing slopes, cold dry snow on polar aspects, and wind affected snow at upper elevations.In northern parts of the region the mid-February weak layer is about 40 cm below the surface and has been reactive in some snowpack tests. The layer is composed of sugary facets, a sun crust on solar aspects, and surface hoar that is present at and below treeline. No recent avalanche activity has been reported on these layers. The snowpack is well settled in southern parts of the region (e.g. Coquihalla and Manning Park).Variable winds in the past month have created cornices on many alpine ridgelines. They will become touchier as they grow in size, as temperatures rise, and as the strong late-winter sun shines down upon them on clear days.

Régions couvertes