Bulletin d’avalanche

South Coast Inland

Feb 6, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Touchy storm slabs reactive to human triggers. Smaller storm slabs may step-down to deeper weak layers, resulting in large, destructive avalanches.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–3
    This problem is more prevalent in the far north areas of the region and is a low likelihood, high consequence scenario that will need to be monitored as snow loads increase.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Touchy storm slabs reactive to human triggers. Use small slopes with low consequence to test the bond of the storm snow.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Monday: Mix of sun and cloud / Light, southwest winds / Freezing level sea level.Tuesday: Mix of sun and cloud / Light, southwest winds / Freezing level sea level.Wednesday: 5-10 cm new snow/ Moderate to strong, southwest winds/ Freezing level 250 m.

Avalanche Summary

Storm slabs are likely reactive to human triggers, especially on leeward slopes that are more wind loaded. In shallow snowpack areas to the north, storm slabs could potentially step-down to deeper weak layers.

Snowpack Summary

35-50 cm(lower amounts in the north) of recent storm snow has buried a wide variety of old snow surfaces including stiff wind slab or wind effected snow at upper elevations, sun crust on steep southerly slopes, surface hoar and surface facets in sheltered locations. The mid-January surface hoar and facet interface is now buried 50-80 cm and the mid-December facets down 90-120 cm remain a concern especially in shallower snowpack areas like the Duffey, Hurley and/ or South Chilcotins. These deeper weaknesses warrant monitoring especially through periods of more load. In southern areas (Coquihalla), the lower snowpack is reportedly well settled(stronger), than it is to the north.

Régions couvertes