Bulletin d’avalanche

Sea To Sky

Feb 16, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Thu
Fri
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Points saillants

We're into a period of HIGH danger with ongoing loading of the snowpack on Wednesday into Thursday: rain to treeline and heavy snow in the alpine.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–3
    Where precipitation falls as snow, watch out for storm slabs, especially on wind-loaded northerly features.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Heavy rain at treeline and below will cause the snow to become soft and cohesionless. Avoid getting pushed into terrain features like gullies and cliffs, where even small slides could have large consequences.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

Warm and wet still on Thursday. Cooling with isolated flurries on Friday, and improving for Saturday.THURSDAY: Rain or wet snow (25-40 mm / cm) / Strong southerly winds in the afternoon / Freezing level around 1400 m. FRIDAY: Mostly cloudy with locally heavy flurries possible (5-15cm) / High temperatures to -1 Celsius / Light westerly winds / Freezing level around 1100 m. SATURDAY: Cloudy with sunny periods / Ridge winds light southerly / Freezing level around 900m / High temperatures to -2 Celsius.

Avalanche Summary

Several small loose wet avalanches were reported at treeline and below on Wednesday. Several natural storm slab avalanches to Size 2 were reported in the alpine on Wednesday.

Snowpack Summary

We had strong southerly winds and heavy rain to 1500m on Tuesday night (and rain to 2000m during the day Wednesday). This new rain (or snow higher up) sits on either wind slabs in the alpine or temperature crusts at treeline and below, especially on east and south aspects. Both of these surfaces will be good sliding layers for future snowfall. The mid and lower snowpack is generally well settled (strong). However, there remain a number of facet and crust layers (down 60-80cm in shallower areas) that are currently dormant but will require monitoring with additional loading (and warming this week), especially in the shallow, rocky areas.

Régions couvertes