Bulletin d’avalanche

Yukon

Avalanche Canada
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Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 4 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Use extra caution on high north-facing slopes, and around cornices, especially if the sun comes out.

Avalanches on steep, rocky slopes could be surprisingly large.

Problèmes avalancheux

  • Wind Slabs

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

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

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5

    With the spring sun packing a punch, be especially aware of your exposure to slopes below cornices during the heat of the afternoon.

Confidence

Moderate

  • We are uncertain due to a highly variable snowpack.

Avalanche Summary

On Monday, near White Pass, a large (size 2) human triggered slab avalanche was reported on a northwest aspect in the alpine (at 1800 m). It is suspected to have failed on or stepped down to a layer of weak, feathery surface hoar.

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.

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 in the daytime sun.

In higher-elevation terrain sheltered from sun and wind, roughly 10 cm of recent snow overlies a mix of older, wind-affected surfaces.

A weak layer of surface hoar persists 50 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

Tuesday Night

Partly cloudy. 20 km/h east ridgetop wind, dropping to calm in the middle of the night. Treeline low -7 °C.

Wednesday

Mostly sunny. 15 km/h southwest ridgetop wind, increasing to 30 km/h through the day. Treeline high -5 °C.

Thursday

Mostly cloudy. 2 cm of snow. 30 km/h west ridgetop wind. Treeline temperature -5 °C.

Friday

Mostly cloudy. 2 to 4 cm of snow. 50 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 careful as you transition into wind-affected terrain.
  • 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.

Régions couvertes