Boletín de aludes

Haines Pass

Apr 21 – 22, 2024Avalanche Canada
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Archivado · caducó 2 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
Sin grado

Lo esencial

Large persistent slab avalanches may remain possible to human trigger in the alpine.

Avoid steep or convex slopes where triggering slabs is more likely.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–2.5

    A few large slab avalanches were recently reported on a variety of aspects on steep alpine slopes. They likely failed on either a crust or a weak layer of surface hoar down 30 to 70 cm.

Confidence

Moderate

Avalanche Summary

Numerous recent wet loose and slab avalanches up to size 2.5 were reported on a variety of aspects in the alpine on Saturday.

The slab avalanches likely failed on either a crust or a weak layer of surface hoar, depending on the aspect of the slope. Strong solar radiation often increases the likelihood of triggering both loose and slab avalanches. See MIN 1 and 2.

Snowpack Summary

A mix of wind affected and soft snow can be found in the alpine. Sunny aspects have a crust on the surface that may soften with daytime heating.

A few large slab avalanches were recently reported on a variety of aspects on steep alpine slopes. They likely failed on either a crust or a weak layer of surface hoar down 30 to 70 cm.

Cornices are large and looming at this time of year.

Weather Summary

Sunday night

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 500 m.

Monday

Mostly cloudy with isolated flurries, 0 to 3 cm snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

Tuesday

Mostly cloudy. 10 to 20 km/h southeast ridgetop wind. Treeline temperature +1 °C. Freezing level 1400 m.

Wednesday

Mix of sun and cloud. 10 to 20 km/h north ridgetop wind. Treeline temperature +1 °C. Freezing level 1400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
  • Avoid steep convex slopes.
  • Be alert to conditions that change with elevation and sun exposure.
  • Cornice failures could trigger very large and destructive avalanches.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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