Bulletin d’avalanche

Lizard-Flathead

Mar 17 – 18, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Tue
Wed
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
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Points saillants

⚠️ Avoid All avalanche terrain ⚠️Soaring freezing levels and solar radiation will likely continue to produce very large naturally triggered avalanches.

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Problèmes avalancheux

  • Cornices

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

    Cornices are large, looming and will likely trigger very large persistent slab avalanches when they fail.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–4

    A crust with weak facets overtop is down 80 to 200 cm. Very large natural and human triggered avalanches occurring on this layer are very likely on Monday.

  • Loose Wet

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

    If triggered loose wet avalanches may step down to deeper layers, resulting in very large avalanches.

Confidence

High

Avalanche Summary

Numerous naturally triggered wet loose and persistent slab avalanches up to size 2.5 (very large) were reported on all aspects at treeline and above on Saturday. See MIN

Very large, natural avalanches are expected to continue to occur on Monday.

Snowpack Summary

High freezing levels overnight will result in no overnight re-freeze of the snow surface. As a result, the avalanche danger will rise rapidly throughout the day.

Cornices have become large and looming, and are more likely to fail during periods of warming.

A widespread, hard crust down 80-200 cm with weak facets above continues to be the primary layer of concern for natural and human triggering of very large persistent slab avalanches.

Weather Summary

Sunday Night

Clear skies. 20 to 30 km/h northeast ridgetop wind. Treeline temperature 4 °C. Freezing level 3100 m.

Monday

Sunny. 20 to 30 km/h west ridgetop wind. Treeline temperature 10 °C. Freezing level 3100 m.

Tuesday

Mix of sun and cloud. 10 to 20 km/h south ridgetop wind. Treeline temperature 3 °C. Freezing level 2200 m.

Wednesday

Mix of sun and cloud. 40 to 50 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level 2200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of intense solar radiation.
  • Only the most simple non-avalanche terrain free of overhead hazard is appropriate at this time.
  • If triggered loose wet avalanches may step down to deeper layers resulting in larger avalanches.
  • Cornice failure may trigger large avalanches.

Régions couvertes