Bulletin d’avalanche

Northwest Coastal

Mar 26 – 27, 2022Avalanche Canada
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Archivé · expiré 5 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Think about warming and solar input as you move through terrain. The likelihood of cornice falls and wet loose avalanches could increase throughout the day.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1.5–2.5

    Wind slabs can still be found in exposed treeline and alpine terrain. Sensitivity to triggering wind slabs could be greater where wind slab has formed over a crust. 

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5

    Limit exposure to cornices. Cornice falls can trigger large avalanches on the slopes below. The likelihood of natural cornice falls could increase with solar input and warming.

  • Loose Wet

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

    Wet loose avalanches will likely occur in steep terrain on solar aspects and lower elevation terrain. The size and sensitivity to triggering could increase throughout the day.

Confidence

Moderate - Uncertainty is due to the fact that cornice falls are particularly difficult to forecast.

Weather Forecast

Saturday night: Light flurries bringing trace amounts of new snow with light south winds. Low of -2 at 900 m. 

Sunday: A mix of sun and cloud with the possibility of light flurries in the morning bringing trace amounts of new snow. Light variable winds. Freezing levels rising to 1400 m.

Monday: Sunny with no new snow expected and light west winds. Freezing level rising to 1400 m.

Tuesday: Mostly cloudy with no new snow expected. Light to moderate south winds and freezing levels rising to 1400 m.

Avalanche Summary

On Friday explosive control triggered several small avalanches as well as one size two cornice, it did not trigger a slab on the slope below. Wet loose avalanches up to size 1.5 were observed in steep terrain at lower elevations and on solar aspects throughout the region.

Snowpack Summary

Variable wind effect in exposed treeline and alpine terrain. Below 1500 m, recent snow tapers in depth and sits over a wet or crusty upper snowpack. Moist snow will likely be observed at lower elevations and solar aspects as the freezing level rises and the sun comes out.

A weak layer of surface hoar from mid March buried 70-120 cm deep can still be found but is considered dormant at this time.

Terrain and Travel

  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • As surface loses cohesion due to melting, loose wet avalanches become common in steeper terrain.
  • Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.

Régions couvertes