Bulletin d’avalanche

North Rockies

Apr 12 – 13, 2022Avalanche Canada
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Archivé · expiré 4 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

 Recent wind has varied in direction so watch for wind slabs on all aspects.

Use high points in the terrain such as ridges or ribs to avoid areas of wind-loaded snow.

Problèmes avalancheux

  • Wind Slabs

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

     Recent wind has varied in direction so watch for wind slabs on all aspects. 

    Use high points in the terrain such as ridges or ribs to avoid areas of wind-loaded snow. 

Confidence

High -

Weather Forecast

Tuesday night: Partly cloudy / Strong east wind / Low of -20 / Freezing level valley bottom.

Wednesday: Mix of sun and cloud / Light east wind / High of -8 / Freezing level valley bottom.

Thursday: Sunny / Moderate east wind / High of -6 / Freezing level 600 m.

Friday: Increasing cloudiness / Light southeast wind / High of -5 / Freezing level 700 m.

Avalanche Summary

A few naturally triggered wind slabs up to size 1.5 were reported on northeasterly aspects in the alpine on Monday.

Snowpack Summary

20-40 cm of recent snow sits on a melt-freeze crust that exists on all aspects to at least 2000 m. A sun crust likely extends to mountain tops on solar aspects.

Recent strong winds from a variety of directions formed wind slabs on lee aspects at treeline and above.

The prominent layer in the upper snowpack is a melt-freeze crust down 40-70 cm.

Cornices are very large and exposure to slopes beneath them should be minimized, especially if the weather is sunny, warm, or windy.

Terrain and Travel

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Caution around slopes that are exposed to cornices overhead.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

Régions couvertes