Bulletin d’avalanche

Jasper

Dec 11 – 12, 2020
Voir sur la carte
Archivé · expiré 6 years ago

Danger d’avalanche

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

Points saillants

Despite the lack of natural activity, there is a lot of new snow present.  Remember Moderate means human triggering remains possible.

Problèmes avalancheux

  • Wind Slabs

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

      Tuesday's 40cm storm had some moderate Southwest winds which loaded some slopes into windslabs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3

    The Nov. 4 crust is down 60cm to 80cm at tree line. Wind slabs potentially could step down to this layer or even deeper to the basal instability creating large destructive avalanches. Caution at thick to thin snowpack areas.

Weather Forecast

Cooler temperatures, no snow, calm to light winds and mostly clear skies are forecasted for the next few days.

Snowpack Summary

40cm of storm snow from Dec 8th with moderate SW winds resulted in mainly ridgetop or exposed treeline wind slabs. The snow is settling. It overlies a variety of surfaces like hard slabs in the alpine and treeline, facets and isolated surface hoar at treeline, and crusts on steep solar aspects. The depth of the Nov 4th rain crust is 60-80cm down.

Avalanche Summary

Wednesday noted numerous loose dry natural avalanches size 1.5 on all aspects and elevations and explosive control resulted in a few slab avalanches size 2 and one size 3 on a Northeast alpine feature. Thursday's patrol noted no new avalanches and the visibility was excellent.

Confidence

Due to the number and quality of field observations

Régions couvertes