Bulletin d’avalanche

Sea To Sky

Mar 18 – 19, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

A cooling trend will eventually help stabilize the snowpack. Continually reassess conditions as you travel into avalanche terrain and be aware of the potential for deeper weaknesses in the snowpack.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Heavy triggers such as a cornice fall or a small avalanche could potentially step down to a weak layer buried about 1 m deep.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Storm slabs may remain reactive at higher elevations and in wind-affected terrain.

Confidence

High - The weather pattern is stable

Weather Forecast

SUNDAY: Clearing skies following the storm with isolated flurries, light northwest winds, alpine temperatures around -10 C.MONDAY: Cloudy with sunny periods, light southeast winds, alpine temperatures around -5 C.TUESDAY: Flurries with 5-10 cm, moderate southwest winds, alpine temperatures around -3 C.

Avalanche Summary

On Saturday, explosive control and ski cutting produced numerous small storm slabs (size 1-1.5) and two size 2 storm slabs up to 50 cm deep. Most failed within the storm snow, but a few on the mid-March rain crust.On Sunday, storm slabs may remain reactive in human triggers and the deeper mid-February weak layer continues to present a low probability / high consequence scenario.

Snowpack Summary

Roughly 30 cm of storm snow now sits above a widespread rain crust up to 2200 m. Thicker wind slabs and large cornices likely exist in alpine terrain. Reports suggest the storm snow is generally well bonded to the crust, and cooling temperatures should help stabilize the upper snowpack. The mid-February crust/facet layer is now 80-120 cm deep and may be up to 200 cm deep in wind loaded terrain. This layer was reactive prior to recent warming events, but now there's some uncertainty as to how long it will remain reactive.

Régions couvertes