Bulletin d’avalanche

Kootenay Boundary

Jan 11 – 12, 2023Avalanche Canada
Voir sur la carte
Archivé · expiré 4 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Make conservative terrain choices as buried weak layers continue to be a concern and new snow takes time to bond to underlying layers.

Problèmes avalancheux

  • Storm Slabs

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

    Storm slabs may reman reactive longer then typical in sheltered terrain features where overlying preserved surface hoar.

  • Deep Persistent Slabs

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

    Human triggering of deep weak layers remains possible in terrain with shallow, variable snowpacks. Where supportive to riders, a melt-freeze crust may be providing a bridging effect, making it more difficult to trigger deeper layers.

Confidence

Moderate

Avalanche Summary

A number of natural and rider-triggered storm slab avalanches were reported on Monday. Occurring from 1800 to 2000 m elevation, on a variety of aspects.

Please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

20 to 30 cm of snow overlies a layer of large surface hoar in wind-sheltered terrain. A melt-freeze crust is buried by roughly 50 to 70 cm. This crust ranges from 2 cm at higher elevations to 10 cm at lower elevations. Below the crust, the mid-snowpack is generally well consolidated. A weak layer of facets and a crust near the bottom of the snowpack remains a concern.

Treeline snow depths are roughly 150 to 200 cm.

Weather Summary

Tuesday night

Mostly clear, no precipitation. Light southwest ridgetop winds. Treeline temperatures 0 to -5 C.

Wednesday

A mix of sun and cloud, with no precipitation. Light southwest ridgetop winds. Treeline temperatures -5 to -10 C.

Thursday

Cloudy with flurries, 2 to 5 cm. Moderate south ridgetop winds. Treeline temperature -5 to -10 C.

Friday

Cloudy with snow, 10 to 15 cm. Moderate south ridgetop winds. Treeline temperatures around 0 C. Freezing levels 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices at this time.
  • Closely monitor how the new snow is bonding to the old surface.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Régions couvertes