Boletín de aludes

Sea To Sky

Avalanche Canada
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Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 5 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

One last day of wintery conditions before spring hits full force, dry snow may be preserved on alpine north-facing slopes.

Continue to practice safe travel and give cornices lots of space.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    New snow and moderate southeast winds are likely forming fresh wind slabs on leeward slopes.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2

    Cornices are large and fragile. Avoid travelling on or under them.

Avalanche Summary

On Thursday, explosive avalanche control produced a large storm slab avalanche over a convex roll. While this avalanche was relatively shallow, it had wide propogation and ran far.

On Wednesday around Whistler, ski cutting produced a few small (size 1) storm slab avalanches.

On Monday and Tuesday around Whistler, a few large (size 2-2.5) natural cornice falls were again reported in the alpine.

Confidence

Moderate

  • We are uncertain due to the track and intensity of the incoming weather system.
  • The snowpack structure is well understood.

Snowpack Summary

Up to 20 cm of new snow has accumulated at treeline and above. Moderate South or Southwest winds will make deeper, denser deposits in leeward terrain.

This falls on generally wind-affected snow in much of the alpine and open treeline, a breakable crust on steep slopes that usually face the sun, and dry, loose snow in sheltered, shaded areas.

60 to 90 cm of mostly settled snow overlies the thick and hard mid-March crust below about 2200 m, and old wind-affected snow above 2200 m. Around Whistler, some facets have been reported around this crust.

Many operators are commenting on how large the cornices have formed this year.

The snowpack below the mid-March crust is wet but well settled and strong.

Weather Summary

Friday Night
Mostly cloudy. 1 to 3 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1200 m.

Saturday
Mostly cloudy. 1 mm of precipitation as snow or rain at treeline. 20 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Sunday
Mostly sunny. 20 km/h west ridgetop wind. Treeline temperature 4 °C. Freezing level 2400 m.

Monday
Mix of sun and clouds. 30 km/h southwest ridgetop wind. Treeline temperature 5 °C. Freezing level 2400 m.

Warming weather will change the game, click this link for great terrain and travel advice.


More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.

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