Bulletin d’avalanche

Jasper

Dec 18 – 19, 2012Parks Canada
Voir sur la carte
Archivé · expiré 14 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    A breakable 10cm + wind slab on an exposed ridge feature did not propagate and expand to an avalanche indicating that more recent wind slabs are still bonding well to the older snow surface.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    The November rain crusts are deteriorating into a facet layer that is not responding to field tests at this time.

Weather Forecast

The weather is expected to be high clouds with sunny periods and no snow accumulations in the next few days.  A frontal system will pass South of Jasper on Wednesday and Thursday, while arctic air may arrive from the North in the forecast area bringing cooler temperatures by mid week.

Snowpack Summary

There is a variety of hard slabs and soft slabs on exposed ridge features and cross loaded gullies in the alpine and tree line.  A breakable 10cm wind slab does not propagate and is bonding well to the old snow surface. Below tree line, there is 10cm + of fresh snow over a supportive mid pack above 1900 meters in sheltered glades.

Avalanche Summary

No new avalanches have been observed since Monday Dec 10.  Wind slabs appear to have bonded well to the old snow surface. The raincrust laminate down in the lower 1/3 of snowpack is deteriorating into a FC layer and does not respond to a compression test.  Test results do show non planar collapses in the basal facets.

Confidence

Due to the number and quality of field observations

Régions couvertes