Bulletin d’avalanche

Sea To Sky

Apr 10 – 11, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Touchy wind slabs exist below ridges in some areas. These can be triggered by the weight of a person.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–7
    Persistent slab avalanches have become less likely, but remain possible, especially with a large trigger like cornice fall.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–4
    Warm temperatures may continue to weaken surface snow, especially at low elevations. Avoid traveling above terrain traps or under any slopes which have glide cracks.

Weather Forecast

Wednesday: Light precipitation. Freezing level around 2200 m, dropping to around 1700 m. Moderate southerly winds.Thursday: Light precipitation. Freezing level around 1200 m. Light southerly winds.Friday: Light precipitation, clearing by afternoon. Freezing level around 1200 m. Light variable winds.

Avalanche Summary

On Sunday, skiers triggered size 1-2 wind slabs on north-west and west aspects following overnight winds. Other recent observations include several loose-wet avalanches up to size 2 from steep solar aspects and wet slabs triggered by skiers below 1400 m. There has been some cornice fall and ice fall.

Snowpack Summary

A melt-freeze crust exists on solar aspects and at low elevations. In some areas, limited overnight cooling has kept surface snow from re-freezing, leaving it loose and cohesionless. Areas of wind slab formed with recent southerly or easterly winds. Dry settling or faceting snow can be found on high north aspects, now buried underneath these wind slabs. A predominately crusty weak interface from late March, now down 50-150cm, has become less likely to trigger, but remains a lingering concern.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Régions couvertes