Bulletin d’avalanche

South Coast Inland

Mar 9 – 10, 2022Avalanche Canada
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Archivé · expiré 5 years ago

Danger d’avalanche

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

Assess for instability before committing to consequential terrain.

Problèmes avalancheux

  • Persistent Slabs

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

    The north of the region (e.g. Duffey, Hurley) may have a a weak layer of faceted grains above a hard melt-freeze crust that is found 30 to 60 cm below the snow surface. A few avalanches over the past week may have released on it, with more activity observed in the neighbouring Sea to Sky region. It is most likely to be problematic on northwest to northeast aspects at treeline and alpine elevations.

Confidence

High - Confidence is due to a stable weather pattern; little change is expected for several days.

Weather Forecast

TUESDAY NIGHT: Clear skies with no precipitation, 20 to 40 km/h north wind, alpine temperature -14 C.

WEDNESDAY: Clear skies with no precipitation, 20 km/h northeast wind, alpine temperature -12 C.

THURSDAY: Mix of sun and cloud with no precipitation, 30 km/h southwest wind, alpine temperature -9 C.

FRIDAY: Cloudy with snowfall, accumulation 2 to 5 cm, 40 to 60 km/h southwest wind, alpine temperature -5 C.

Avalanche Summary

No new avalanches were observed on Monday. Looking forward, naturally-triggered avalanche activity is likely decreasing during this cold weather but riders could trigger persistent slab avalanches, where they exist.

Snowpack Summary

5 to 10 cm of recent snow sits on a surface melt-freeze crust on all aspects below around 1600 m and on sun-exposed slopes into the alpine. Settled dry snow remains on shaded slopes above around 1600 m. Reports suggest that recent northerly wind did not form new wind slabs, though extra caution is advised in steep terrain where isolated pockets may have formed.

Around 30 to 60 cm deep, sugary faceted grains may be found around a melt-freeze crust from February in the north of the region (e.g., Duffey, Hurley). The layer may be most prevalent on northeast to northwest aspects at treeline and alpine elevations. We've received limited avalanche observations on this layer, but it should be treated as suspect anywhere it exists. Check out this forecaster blog for more info. Various crusts may be found in the south of the region but reports suggest they are bonding to the snowpack and are not an avalanche concern.

There are no deeper concerns at this time.

Terrain and Travel

  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Be aware of the potential for large avalanches due to the presence of buried persistent weak layers.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

Régions couvertes