Bulletin d’avalanche

South Rockies

Apr 4 – 5, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–6
    Loose avalanches can be initiated by skiers and sledders at all elevations and can entrain a large amount of moist snow.  Natural triggers such as cornices are also a concern.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Wet loose avalanches may trigger wet slabs in the alpine.Gaping cracks in the snowpack called "Glide Cracks" may release to ground suddenly with warm temperatures and rain.

Confidence

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

Weather Forecast

A western flow will bring a series of lows into our region starting on Thursday night.  Moderate precipitation will result with mixed snow and rain into the weekend.  There will be a gradual cooling trend that seems to peak on Sunday.Thursday overnight: Light to moderate snowfall/rain overnight / Light southwest winds / Freezing levels 1800mFriday: Light to moderate snowfall/rain / moderate southwest winds / Freezing levels up to 2000m during the afternoon.Saturday:  Light precipitation / light to moderate south west winds / Freezing levels up to 2000m during the daySunday:  Light to moderate precipitation possible / light easterly winds / Freezing levels dropping to 1600m during the day and 900m overnight

Avalanche Summary

A natural size 2.5 wet slab out of the alpine occurred sometime in the last 24 hours on a south facing shoulder of Mt Hosmer.  A size 2.5 glide release, 50 meters wide and to ground was reported in the nearby Lizard Range on a steep east facing slope on Wednesday.Earlier in the week, numerous wet slab avalanches and glide crack releases to size 3 were observed  from South to West aspects.

Snowpack Summary

The classic melt freeze cycle has come to an end with cloud and warm temps preventing a good refreeze in most of the forecast region. Along with the solar aspects, previously dry north facing zones in the alpine are also now moist.  A buried rain crust can be found down 25-50 cm and exists up to around 2100 m.   Larger triggers such as a loose wet slide, or cornice fall may cause this layer to fail.Snow is isothermal on south facing aspects in the alpine/treeline and on all aspects below treeline. 

Régions couvertes