Bulletin d’avalanche

South Coast Inland

Mar 9 – 10, 2023Avalanche Canada
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Archivé · expiré 4 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Lingering wind slabs may remain reactive to human triggers on a variety of aspects in the alpine.

Avoid travelling on slopes below cornices.

Problèmes avalancheux

  • Wind Slabs

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

    Lingering wind slabs may remain reactive on a variety of aspects in the alpine.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    Cornices are large and may fail with daytime heating. Cornice failures act as heavy triggers and can trigger large avalanches on slopes that a single rider would not trigger.

  • Deep Persistent Slabs

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

    A layer of weak facets sits near the base of the snowpack. This layer is most likely to be problematic in steep, unsupported, wind-loaded terrain in the northern part of the region around the Chilcotins, Birkenhead, and Hurley.

Confidence

Moderate

Avalanche Summary

A cornice triggered size 1.5 wind slab avalanche was reported on a northwest aspect in the alpine in the Duffey zone on Tuesday.

Additionally, there was a MIN report of a size 1 skier triggered loose dry avalanche in the alpine.

Snowpack Summary

Cornices are large and may fail with daytime heating.

Sun crust on sunny aspects. Recent southeasterly winds formed wind slabs on numerous aspects at treeline and above. These slabs sit on a variety of surfaces including sun crusts, facets, and previous wind effect.

The mid-snowpack is well consolidated.

This is not the case for the lower snowpack. There is a widespread weak layer of large sugary facets at the bottom of the snowpack. Recent avalanche activity on this layer has been confined to northern parts of the region in the Chilcotins.

Weather Summary

Wednesday Night

Clear skies / Light southeast ridgetop wind / Low temperature at treeline -11 C / Freezing level valley bottom.

Thursday

Mix of sun and cloud / Light southeast ridgetop wind / High temperature at treeline -3 C / Freezing level 1100 m.

Friday

Cloudy with isolated flurries; 0-3 cm / Moderate southeast ridgetop wind / High temperature at treeline -4 C / Freezing level 900 m.

Saturday

Mix of sun and cloud / Light southwest ridgetop wind / High temperature at treeline -2 C / Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Avoid shallow snowpack areas, rock outcroppings and steep convex terrain where triggering is most likely.
  • Avoid exposure to slopes that have cornices overhead.
  • Be alert to conditions that change with elevation and sun exposure.

Régions couvertes