Bulletin d’avalanche

Blue River

Jan 23 – 24, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

More snow and warm temperatures will promote storm slab development.

Be cautious in areas where the surface snow feels heavy and cohesive.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3.5

    Two weak layers of surface hoar and facets exist deeper in the snowpack.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5

    New storm slabs have been building with continued snow and warm weather. They are resting on a weak layer of facets and in places surface hoar. This could mean they will be more reactive and slower to bond.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3.5

    Basal facets remain a concern in steep, rocky alpine features with thin-to-thick snowpack transitions.

Confidence

Moderate

Avalanche Summary

A natural storm slab cycle was reported on Sunday up to size 2, on all aspects and elevations. All of them failed on a weak layer of facets.

Earlier in the storm on Wednesday, two persistent slab avalanches (size 1 and 2) were remotely triggered by skiers in the Northern Selkirks. These avalanches occurred on north aspects at treeline.

Snowpack Summary

20 to 30 cm of surface snow is now resting on a variety of old snow surfaces including faceted snow, surface hoar and firm wind slabs in open terrain at treeline and above.

Down 60 to 80 cm a crust, facet, and/or surface hoar layer exists.

130+ cm down another surface hoar layer exists that was buried in early December. This seems to be of most concern above 2000 m where a robust crust doesn't exist above it, or in shallow snowpack areas.

Weather Summary

Monday Night

Cloudy with 5-10 cm of snow, south alpine wind 10-50 km/h, treeline temperature around -4 °C.

Tuesday

Cloudy with up to 5 cm of snow, southwest alpine wind 10-40 km/h, treeline temperature around -2 °C, freezing level 1400 m.

Wednesday

Mix of sun and cloud with up to 5 cm of snow, southwest alpine wind 20-40 km/h, treeline temperature around -2 °C, freezing level 1400 m.

Thursday

Cloudy with up to 5 cm of snow, southwest alpine wind 10-30 km/h, treeline temperature around -1 °C, freezing level 1400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.

Régions couvertes