Bulletin d’avalanche

Sea To Sky

Jan 13, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Wind slabs can currently be found on almost any aspect. Expect those on steep southerly slopes to be especially touchy.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Watch for soft slabs on sheltered northerly aspects, and touchy wind slabs on 'reverse loaded' southerly aspects. Expect stability on southerly aspects to deteriorate quickly with any solar radiation input.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

We're in a fairly stable weather pattern with seasonal temperatures and a slight chance of flurries on Saturday. Things change significantly Monday -Tuesday, stay tuned. FRIDAY: Sunny with cloudy periods and no new snow. Winds light - moderate from the west. Alpine high temperatures to -6 Celcius. SATURDAY: Mainly cloudy with isolated flurries and a trace of new snow. Winds moderate (20-35 Km/hr) from the southwest. Freezing level rising to 800 metres with alpine temperatures to -5 Celcius. SUNDAY: Increasing clouds in the afternoon with snow overnight. Winds light southwesterly. Freezing level rising to 1200m and alpine temperatures around -4 Celcius.

Avalanche Summary

A video of a snowboarder caught Wednesday in a Size 2 avalanche near Brandywine (Chocolate Bowl) has gone viral. See the MIN post below for more details:https://avalanche.ca/map/forecasts/sea-to-sky?panel=mountain-information-network-submissions%2F8c832980-b83c-4b4f-a23d-540ed9bfe606A Size 2.5 natural was seen on the south aspect of Mt Currie near 2100m elevation.

Snowpack Summary

Wildly variable wind effect is the main story here. In the days since the last storm (Sunday-Monday), winds shifted to classic outflow (northerly) patterns with strong winds at ridge top for 24 hours. By and large this 'reverse loaded' snow in the alpine and also affected treeline elevations too. Touchy windslabs (5-40 cm thick) formed on southerly slopes near ridge crests and roll overs. These slabs are the primary weakness of concern in the snowpack and our colder-than-usual temperatures of late mean the upper snowpack will be slower than usual to heal. Deeper in the snowpack, the new snow from Sunday night and also last Friday is bonding fairly well to a variable surface consisting of a mix of soft wind slabs, hard wind slabs, sastrugi, faceted snow, and even some surface hoar. Snowpack layers below this interface are generally well bonded, and the lower snowpack is solid.

Régions couvertes