Bulletin d’avalanche

Sea To Sky

Avalanche Canada
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Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 5 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

There's still a bit of winter hanging on in the alpine. Cornices yet to drop, dry snow yet to shed in a wet loose cycle, maybe even a stubborn wind slab or two. Pack sunglasses, not blinders!

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2

    Wind slabs may still be triggerable on north facing, alpine slopes less affected by recent sun and warming.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Large, fragile cornices exist. Be aware of overhead hazard, and stay back from overhanging cornices on ridgelines.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Slushy, isothermal snow conditions can emerge on sun-facing slopes during the heat of the day. Plan your route with this dynamic in mind to avoid getting surprised by difficult travel and rising wet loose avalanche danger.

Confidence

High

  • We have a good understanding of the snowpack structure and confidence in the weather forecast.

Avalanche Summary

Avalanche activity has quieted since the weekend warmup, but several more natural wet loose avalanches up to size 2.5 were observed in the Whistler area again on Monday. This was focused on west aspects above 2000 m. Ski cutting produced several size 1.5 releases.

On the weekend, wet loose activity was reported at all elevations to size 2.5. In addition, numerous cornice falls and wind slab avalanches were reported.

Snowpack Summary

Spring-like melt-freeze cycles now characterize a daily evolution of surface conditions on all but north-facing slopes above 2000 m, where 10 to 20 cm of dry snow may still be found.

A crust/facet layer from late March sits 20 to 80 cm deep. It isn't presently a concern but perhaps gives cornice falls from high north aspects some chance of triggering a slab.

A thick crust sits 80-100 cm deep. Near Whistler, some facets have been reported around this crust. The snowpack below is moist, but well settled and strong.

Weather Summary

Tuesday Night
Clear skies. 10 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 1600 m.

Wednesday
Sunny. 10 km/h northwest ridgetop wind. Treeline high temperature 2 °C. Freezing level to 1800 m.

Thursday
Sunny. 10 km/h east ridgetop wind. Treeline high temperature 6 °C. Freezing level to 2500 m.

Friday
Sunny before clouding over near end-of-day. 5 to 20 km/h southeast ridgetop wind, increasing. Treeline high temperature 7 °C. Freezing level to 2700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Rocks will heat up with daytime warming and may become trigger points for loose wet avalanches.
  • Limit exposure to steep, sun exposed slopes, especially when the solar radiation is strong.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

Régions couvertes