Bulletin d’avalanche

Sea To Sky

Apr 16 – 17, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Wind slabs and cornices are the main concerns right now. Carefully assess terrain before committing to bigger lines.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Isolated wind slabs may still be lingering in the alpine and exposed treeline features.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Where they exist, cornices pose a significant hazard and should be avoided.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    If the snow does not experience an overnight re-freeze, there is an increased risk of loose wet avalanches. Even small slides can have serious consequences.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain on Tuesday

Weather Forecast

We're back to wet spring weather on Monday, and continuing throughout the forecast period. MONDAY: Rain (5-10mm) falling mostly after noon, with wet snow (5-10cm) above 1500m. Winds 20-30 km/h from the south.TUESDAY: Wet snow or rain (10-20mm / cm). Freezing level around 1500 m. Winds moderate southwesterly.WEDNESDAY: Rain (10-15mm) up to 1600m. Winds strong southerly.

Avalanche Summary

On Sunday, skiers were able to trigger Size 1 wind slabs near Whistler, running in recent storm snow. Small, loose wet avalanches were also reported during the heat of the day on Sunday.

Snowpack Summary

We've had 20-30 cm of settling storm snow above 1500m. Warm temperatures on Sunday (+4 at treeline) likely resulted in a melt-freeze crust on all aspects and elevations at treeline and below. Lingering wind slabs may still exist in exposed terrain features at treeline and above. Cornices remain large in some areas and could trigger large avalanches when they fail. The fatal accident near Lions Bay a week ago illustrates the danger of cornices breaking off, and the large avalanches they can trigger.

Régions couvertes