Bulletin d’avalanche

Cariboos

Apr 12 – 13, 2013Avalanche Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

The intensity of Friday night's storm is uncertain. If snowfall amounts are higher than anticipated or if the storm persists throughout Saturday morning, the avalanche danger may be HIGH in the alpine.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–6
    Ongoing wind and snowfall has added to size and fragility to existing cornices. Cornice falls may be destructive by themselves, and may also trigger large avalanches on the slope below.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–4
    Moderate snowfall and strong winds forecast for Friday night will create new storm/ wind slabs. Storm slabs will be particularly touchy in wind-affected terrain.

Confidence

Fair - Intensity of incoming weather is uncertain on Friday

Weather Forecast

Overnight Friday and Saturday: Moderate snowfall on Friday night tapering to light snowfall on Saturday / Strong southwest winds switching to moderate and northwesterly / Freezing level at 1200mSunday: Trace amounts of snow with overcast skies / Moderate northeast winds / Freezing level at 1200mMonday: Mix of sun and cloud / Calm winds / Freezing level at 1200m

Avalanche Summary

Natural loose dry avalanches to size 2 ran within Wednesday's storm snow, and a size 2 wind slab was ski cut on a northeast alpine slope just below ridge crest. A size 2 natural slab avalanche was observed in a north facing gully feature at 2100m. The early April interface was the suspected culprit. Although recent snow may be gaining strength, I would expect another round of storm slab activity to occur in response to wind and snow forecast for Friday afternoon.

Snowpack Summary

At upper elevations moderate amounts of recent snow have been shifted into deeper windslabs by steady southwest winds. About 40-75cm below the surface you are likely to find a temperature/sun crust from early April's clear weather. At the same interface you may find a layer of spotty surface hoar on shaded alpine slopes above ~2400m. At lower elevations (below 1600m) rain has saturated the snowpack, and surfaces are either moist or refrozen (temperature depending).Recent snowfall combined with wind have made large cornices bigger and more likely to fail.

Régions couvertes