Bulletin d’avalanche

Blue River

Jan 18 – 19, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré

Points saillants

The new snow may form reactive storm slabs, in areas where a slab is not found dry loose avalanches are likely.

Persistent slabs are best managed through conservative terrain selection.

Problèmes avalancheux

  • Persistent Slabs

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

    Two weak layers of surface hoar exists deeper in the snowpack. They have been recently been reactive and triggered by people. As the unconsolidated snow settles and forms a slab, a reactive upper snowpack may exist.

  • Storm Slabs

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

    Storm slabs may be touchier in wind effected terrain.

    Dry loose power sluffing will likely exist in wind sheltered terrain, especially on steep slopes.

  • 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

On Tuesday, dry loose sluffing from steep slopes and terrain features were seen.

New storm slabs may be reactive on Thursday, especially in wind affected terrain. Dry loose power sluffing may be the name of the game in most places that are sheltered from the wind.

Snowpack Summary

Up to 25 cm of low-density storm snow has buried a variety of snow surfaces. It sits above unconsolidated faceted snow, surface hoar and firm wind-pressed snow in open terrain at treeline and above.

Down 50 -70 cm, a crust, facet and or surface hoar layer exists. This may become a problem once the snow above starts to stiffen and form a slab.

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.

The depth of the snowpack varies greatly throughout the region and weak basal facets are present at the base of the snowpack.

Weather Summary

Wednesday Night

Cloudy with possible clear periods, ridgetop wind 15-20 km/h from the east, treeline temperatures near -15 C.

Thursday

A mix of sun and cloud, ridgetop wind 10-15 km/h from the east and treeline temperatures near -9 C.

Friday

New snow 5-10 cm, ridgetop wind 10-20 km/h from the southeast, treeline temperature -3 C.

Saturday

New snow 5-10 cm, ridgetop winds light from the southwest, treeline temperatures near -3 C. Freezing levels 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.

Régions couvertes