Boletín de aludes

Yukon

Avalanche Canada
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Peligro de aludes

Wed
Thu
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
Sin grado
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Desactualizado: este boletín caducó 4 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Use extra caution on high north-facing slopes, where wind slabs may be reactive in wind-loaded terrain and deeper instabilities may exist in thin, rocky areas.

Problemas de aludes

  • Wind Slabs

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

    Reactive wind slabs persist in steep northerly terrain and may be remotely triggered due to the underlying surface hoar layer.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    2–3

    A faceted lower snowpack presents a persistent slab problem. Weak layers deep in the snowpack may be triggered by cornice fall or on steep features where the snowpack transitions from thick to thin.

Confidence

Moderate

  • We are uncertain due to a highly variable snowpack.

Avalanche Summary

Avalanche reports were limited over the weekend, with one size 1 wind slab on an east-facing slope.

On Friday, a skier remotely triggered a size 2 wind slab on a north-facing slope at 1900 m, failing on a surface hoar layer about 50 cm deep. A similar avalanche was reported just outside the region in an area with a comparable snowpack.

Overall, wind slab activity continues, while the deep persistent problem remains a concern due to weak snowpack structure.

Snowpack Summary

A variety of surfaces exist across aspects and elevations. Firm, supportive crusts are present at lower elevations and on sun-exposed slopes; these may soften with possible sunny breaks.

In higher-elevation terrain sheltered from sun and wind, roughly 20 cm of recent snow overlies a mix of older, wind-affected surfaces.

A weak layer of surface hoar persists 40 to 70 cm below the surface in northerly alpine terrain.

The lower snowpack remains faceted and generally weak, especially in shallow snowpack areas.

Weather Summary

Monday Night

Partly cloudy. 0 to 1 cm of snow. 10 km/h north ridgetop wind. Treeline temperature -6 °C.

Tuesday

Mostly cloudy. 2 to 4 cm of snow in the morning then mix of sun and cloud in the afternoon. 20 km/h northeast ridgetop wind. Treeline temperature -4 °C.

Wednesday

Mostly sunny. 30 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Thursday

Mix of sun and clouds. 0 to 1 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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