Bulletin d’avalanche

Sea To Sky

Feb 11 – 12, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Human triggered avalanches remain likely on Sunday in wind-loaded (northerly) features in the alpine. Avoid stiff wind slab areas or wind loaded pockets.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    The warming trend throughout the storm has created a tricky condition where warmer heavy snow is sitting on-top of colder snow, making storm and wind slab avalanches much more likely.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Seasonal temperatures and isolated flurries through the weekend. Significant warming Monday onwards.SUNDAY: Mix of sun and cloud / Light, southwesterly winds / Freezing level rising to 1500 m by late afternoon. MONDAY: Sunny with cloudy periods, warming significantly with highs to +2 Celsius / Moderate southeasterly winds / Freezing level around 2000 m. TUESDAY: Mostly cloudy / High temperatures to +3 Celsius / Light-moderate southwesterly winds/ Freezing level around 2200 m.

Avalanche Summary

A few Size 1 avalanches were triggered with explosive control work on Sunday.

Snowpack Summary

40-80 cm of recent storm snow fell with moderate to strong southerly winds and formed variable wind slabs on northerly aspects. Inverted temperatures (warmer at higher elevations) made the slab problem worse. The new snow has buried a wide variety of old snow surfaces including stiff wind slab or wind affected snow at upper elevations, sun crust on steep southerly slopes, surface hoar (up to 10 mm) in sheltered locations. In sheltered ares where the recent storm snow is overlying surface hoar (weak, feathery crystals), you may see increased reactivity on this layer as the storm snow begins to settle into a more cohesive slab. The mid and lower snowpack is generally well settled (strong). However, there remain a number of facet and crust layers that are currently dormant but will require monitoring with additional loading (and warming early next week), especially in shallower, rocky areas.

Régions couvertes