Bulletin d’avalanche

South Coast

Mar 16 – 17, 2016Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Strong sunshine will increase avalanche danger during the day. Plan your route to minimize exposure to big sun-drenched slopes in the afternoon.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    We could see fresh wind slabs form in immediate lee terrain from moderate northeasterly winds on Thursday. Sun and afternoon warming may increase the sensitivity of triggering a slab.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    Cornices are reported to be large and weak. Natural cornice releases are possible with sun exposure and warming.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Loose wet sluffing is likely in steep sun-exposed terrain during the day. 

Confidence

High

Weather Forecast

THURSDAY: Mainly sunny. The freezing level is around 1400-1600 m. Ridge winds are moderate from the northeast. FRIDAY: Mainly sunny. The freezing level should jump to around 1800-2000 m and ridge winds are light gusting to moderate from the southeast. SATURDAY: Increasing cloud. The freezing level is around 1800 m and winds remain light.

Avalanche Summary

Cornices continue to pop off with regularity. Some are triggering slabs below and others are not. In the north of the region on Sunday, a cornice collapse triggered a size 3.5 deep slab avalanche which failed on glacier ice. A second size 3.5 deep persistent slab was observed nearby on Tuesday likely occurring around the same time). Forecasts sunshine and warming will cause cornice activity to increase and result in loose wet sluffing from steep sun exposed slopes.

Snowpack Summary

Up to 75cm of snow fell over the last week or so. This snow is reported to be settling and gaining strength, but lingering storm instabilities may still exist, especially in recently wind loaded terrain features. Cornices are reported to be large and fragile. Expect to encounter a sun crust or moist snow on sun-exposed slopes depending on the time of day. The mid and lower snowpack are generally strong and well-settled. Below 1200m the snowpack is reported to be isothermal.

Régions couvertes