Bulletin d’avalanche

North Rockies

Feb 3 – 4, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Wed
Thu
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Strong east winds are reverse-loading the recent storm snow in exposed areas.

Slab avalanches remain reactive to riders.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–3

    Strong east winds have reverse loaded exposed alpine and treeline features.

  • Persistent Slabs

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

    A slab overlies a layer of surface hoar, facets and/or a crust. Use conservative terrain choices while this problem persists.

Confidence

Moderate

Avalanche Summary

Several Na and human-triggered size 2 avalanches have been reported since Friday. The avalanches are releasing on surface hoar below the storm snow. This MIN from the Pass Lake area is a good example of how touchy this problem is.

Snowpack Summary

Exposed areas are heavily wind-affected. Up to 50 cm of new snow has fallen since Wednesday. The new snow is bonding poorly to old snow surfaces, which include a melt-freeze crust on sun-exposed slopes, large surface hoar and/or facets on shaded slopes, and wind-affected snow in exposed terrain at ridgelines.

A widespread crust with facets and/or surface hoar, buried in mid-January, is approximately 60 to 120 cm below the surface.

The lower snowpack is well-settled.

Weather Summary

Sunday night

Mostly cloudy. 20 to 40 km/h east ridgetop wind. Treeline temperature -27 °C.

Monday

Mostly cloudy. 20 to 50 km/h east ridgetop wind. Treeline temperature -26 °C.

Tuesday

Scattered cloud. 30 to 60 km/h east ridgetop wind. Treeline temperature -20 °C.

Wednesday

Few clouds. 10 to 20 km/h east ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Expect slab conditions to change drastically as you move into wind-exposed terrain.
  • Make observations and continually assess conditions as you travel.
  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

Régions couvertes