Bulletin d’avalanche

South Columbia

Apr 8 – 9, 2016Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Sun
Mon
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

Spring conditions. Avalanche danger is expected to rise during the day with warming and solar radiation. Plan to retreat to cooler north-facing terrain if the snow surface is becoming moist or wet.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    Cornices could fail easily during the day when temperatures soar and the sun reappears.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Loose wet activity should continue, particularly on solar aspects during the day.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3–6
    Intense solar radiation, a heavy wet surface sluff, or a cornice fall could be enough to trigger lurking deep weaknesses creating a destructive wet slab.

Avalanche Summary

A fairly widespread but small (size 1-1.5) loose wet avalanche cycle was observed on steep solar aspects on Thursday. There were also a few reports of isolated slabs up to size 2 from north-facing alpine slopes. The possibility of persistent slabs and cornice falls should increase if the snowpack does not refreeze overnight and temperatures remain high.

Weather Forecast

SATURDAY: A mix of sun and cloud. The freezing level could drop to 1700 m overnight before rising to around 2300 m during the day. Northwesterly winds peak overnight and ease to light northerly during the day. SUNDAY: Mainly sunny. The freezing level shoots up again to 2500-2600 m and winds are light and variable. MONDAY: A mix of sun and cloud. The freezing level remains near 2600 m and winds are light.

Confidence

High

Snowpack Summary

Sunshine and soaring temperatures resulted in moist or wet snow on all aspects and elevations, except true-north slopes above around 2200 m. Temperatures did not cool much overnight on Thursday, which probably prevented a strong refreeze. This may be the case again heading into the weekend. A couple crusts could exist in the top 60-80 cm up to around 2000 m. The late February persistent weak layer is down 80 to 120 cm below the surface. This layer may be a concern in isolated terrain, but it will probably take a large trigger like a cornice fall or surface avalanche in motion to set it off. A moist/wet, isothermal, and rapidly melting snowpack exists on all aspects below around 1500 m.

Régions couvertes