Bulletin d’avalanche

Haines Pass

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

Continually assess as you travel, and retreat to mellower terrain if signs of instability are observed.

Both wind slabs and persistent weak layers remain a concern in steep alpine terrain.

Problèmes avalancheux

  • Wind Slabs

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

    Recent variable winds have created wind slabs in alpine terrain atop a variety of old surfaces.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4

    A layer of facets over a crust is buried 80 to 150 cm. There have been no new reports of avalanches on this layer, and it is likely difficult to trigger with the generally benign weather.

Confidence

Moderate

  • We are uncertain due to a limited number of field observations.

Avalanche Summary

On Monday, west of Haines and just south of our forecast area, two human triggered avalanches were reported in northwest facing alpine terrain. One storm slab and one cornice fall.

A few wet loose avalanches were observed in steep rocky terrain near Kelsall Lake over the weekend.

Snowpack Summary

Light snowfall has been redistributed by variable winds at higher elevations, with a dusting covering a crust on south-facing slopes.

A persistent weak layer of facets and crust is 80 to 150 cm deep in the alpine, and would most likely be triggered by large loads, like a cornice fall, or in thin-to-thick snowpack transitions.

See this AvCan Yukon MIN report report for a detailed conditions update as of Friday, April 10.

Weather Summary

Tuesday Night

Clear skies. 15 km/h southwest ridgetop wind, dropping to calm in the middle of the night. Treeline low -6 °C.

Wednesday

Sunny. 20 km/h west ridgetop wind. Treeline high -4 °C.

Thursday

Mix of sun and clouds. 1 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Friday

Mostly cloudy. 3 to 5 cm of snow. 40 km/h south ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Régions couvertes