Bulletin d’avalanche

Jasper

Feb 20 – 21, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

The persistent slab problem continues to make it difficult to travel unabashedly through avalanche terrain with any degree of confidence, especially at, and just above treeline.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5
    While the winds are now starting to back off, they blew hard, and from a variety of directions all week. Fresh windslabs that are hard in the alpine and exist well into treeline areas can be expected to be be sensitive to skier triggering.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3
    A stiff slab 50 to 90cm thick, sits over sun crusts on south and west aspects, Surface Hoar preserved at, and just above treeline and weak faceted crystals lurking in shallow snowpack features. This is a dangerous problem that is difficult to avoid.

Weather Forecast

Light north winds will continue as will the cold temperatures with alpine lows near -25C and daily highs near -18C. While no snow is expected for most of the week, a fair amount of cloud can be expected for the period. First moderate UV values of the season, bring your sunscreen.

Snowpack Summary

15cm snow over the last week, and available snow from the previous storms, has been redistributed by strong winds from variable directions to build slabs and wind effect in open areas. A persistent slab sitting on three weak layers down 50 to 80cm can be found throughout the forecast region and has produced many large avalanches traveling full path

Avalanche Summary

No new avalanche activity observed or reported in the last week however an extensive cycle resulted when the persistent slab became overloaded with successive storms totalling 50cm each on January 30th and February 8th. Avalanches to size 3.5 were observed from most aspects and at most elevations with the majority of the action seen around 21-2500m

Confidence

Due to the number of field observations

Régions couvertes