Bulletin d’avalanche

Vancouver Island

Dec 7 – 9, 2017VIAC
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3
  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3

Avalanche Summary

Loose wet avalanches at treeline and below treeline on exposed solar aspects with pinwheeling and tree bombs.

Confidence

Moderate - no alpine snow pack observations and most obersvations limited to Eastern Central Vancouver Island.

Travel/Terrain Advice

Very high temperatures and freezing levels and no overnight freezing of upper snow pack will result in very moist to wet snow that provides little support to travelers. Be aware that even small loose wet avalanches can push one into or over terrain traps such as depressions, cliffs, and trees. There is potential for large to very large avalanches starting in treeline and alpine terrain to impact below treeline elevations. Use caution when crossing large avalanche paths in all elevations. Watch for early season hazards such as exposed creeks, stumps, and tree wells especially below treeline.

Past Weather

Vancouver Island has seen little to no precipitation, light to moderate SW through SE winds and temperatures ranging from -7oC to +6oC. Freezing levels across the forecast region have ranged from sea level to 2300 m.

Snowpack Description

Surface - Thin unsupportive melt freeze crust on solar aspects at all elevation, in some shaded areas snow remains cold Upper - Wind loaded pockets bonding moderately to an upper crust on NW-NE aspects at treeline and alpine. Scoured and pressed surface on windward slopes exposing the crust Mid - Well settled crust complex Lower - Well settled

Weather Forecast

Temperatures and freezing levels will remain high with potential freezing levels of up to 3600 m with the persistent high pressure system. Expect a temperature inversion for the duration of the forecast period with low level clouds and morning fog near the ocean. Wed - No new snow. Winds light SE Freezing level to 2800-3600 m Thur - No new snow. Winds light to moderate SE Freezing level to 2500-3600 m Fri - No new snow. Winds light to moderate SE Freezing level to 1200-3600 m

Régions couvertes