Bulletin d’avalanche

South Coast Inland

Mar 25 – 26, 2021Avalanche Canada
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Archivé · expiré 6 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible

Points saillants

Lingering wind slabs in open terrain at upper elevations are the main concern.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Recent snow has likely been blown into wind slabs at higher elevations. Carefully assess for wind slabs prior to committing to steep features with high consequence.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Cornices are large and looming along many ridgelines, and have likely grown with the recent snow and wind. 

Confidence

Moderate - The snowpack structure is generally well understood.

Weather Forecast

THURSDAY Night: Cloudy with clear periods and isolated flurries, light to moderate west and northwest wind, freezing level 700 m with treeline temperatures around -5 C.

FRIDAY: Mix of sun and cloud with isolated flurries, light west and southwest wind, freezing level 1600 m with treeline temperatures -1 C.

SATURDAY: Mostly cloudy with isolated flurries, light to moderate southwest wind, freezing level 1500 m with treeline temperatures -2 C.

SUNDAY: Snow, moderate to strong southwest wind, freezing 1000 m with treeline temperatures around -4 C.

Avalanche Summary

Small avalanches were triggered within recent snow on Tuesday. This was likely the case for Wednesday as well, within the 5-15 cm of overnight snow.

Looking forward, wind slabs may remain triggerable at higher elevations and use caution on sun-exposed slopes if clear skies prevail, which is forecast for the north of the region.

Snowpack Summary

Another 5 to 15 cm of snow on Wednesday adds to the 15 to 30 cm of settled snow from the weekend. All this snow is likely bonding to the snowpack, but there could be some wind slabs that linger at higher elevations from southwest wind. All this snow sits above a widespread hard crust, with the exception of high north-facing terrain. The lower snowpack is strong and settled.

Remember that cornices along ridgelines are large at this time of year and always have the possibility of failing naturally or from the weight of a human.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Régions couvertes