Bulletin d’avalanche

Jasper

Dec 18 – 19, 2023Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible

Points saillants

Natural avalanches are unlikely but human triggered avalanches are still possible. Alpine wind loaded features should be approached with caution.As temperatures rise above zero in the lower elevations, ice climbers should watch for overhead hazards in form of loose wet/dry sluffs or a rock fall.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2

    Strong to extreme southwesterly winds created a few wind slab layers over the last week. Wind slab natural activity seems to have petered off in the last 48 hours.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–3

    No natural activity observed. Keep this on your radar as triggering remains possible with the shallow nature of the overall snowpack. This problem is of most concern in wind loaded alpine features, specifically below ridge tops.

Terrain and Travel Advice

  • Avoid areas where the snow feels stiff and/or slabby.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Confidence

Moderate

Avalanche Summary

Few small wind slabs observed in the last few days across the region. These slabs were found near ridge tops on northerly aspects and did not step down to deeper instabilities.

Snowpack Summary

The snowpack is 50-80cm deep and is weak and facetted. A surface hoar layer is down 15-20cm below 2300m. Strong winds have stripped exposed alpine and tree-line terrain and created wind-slabs in cross-loaded and lee features. Windward slopes are either stripped of snow or the snow left has been pressed into sastrugi.

Weather Summary

The Mountain Weather Forecast is available at Avalanche Canada https://avalanche.ca/weather/forecast

MondayCloudy with scattered flurries. Accumulation: 4 cm. Alpine temperature: High -2 °C. Ridge wind southwest: 10-30 km/h. Freezing level: 1900 metres.

Régions couvertes