Bulletin d’avalanche

Jasper

Feb 25 – 26, 2019Parks Canada
Voir sur la carte
Archivé · expiré 8 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

In addition to listed problems, be vigilant for isolated windslabs in the Columbia Icefields region. 

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5
    Isolated to steep terrain where surface snow doesn't show signs of previous wind affect : all elevations at the north end of the bulletin region, but only lower elevations in the Columbia Icefields region

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1.5–3
    Although the basal weakness (depth hoar) is generally dormant, with no recent natural loading of the snowpack, these may still be possible in isolated places. Steep, unsupported, and thin depth are factors to be wary of, as are cornices overhead.

Weather Forecast

Cold, static High pressure continues. Monday: Mainly Sunny, Treeline Low -24, High -18, Light winds. Tuesday: Sunny, Low -25, High -17, Moderate Easterly Alpine winds easing to Light.Wednesday: Winds remain subdued, but cloud is possible and temperatures finally climb, possibly to -10. Mountain weather forecast available at Avalanche Canada.

Snowpack Summary

Towards the Icefields, the alpine is wind affected. The Jan 18 surface hoar layer (down 40cm) has faceted away in most places, but shows isolated sensitivity at treeline and below in the Icefields region. The midpack is mainly supportive, over depth hoar in shallow areas. Although structurally weak, this layer has been generally dormant lately.

Avalanche Summary

No notable avalanches were seen on Sunday, only evidence of previous small (size 1) loose dry and windslab avalanches from the previous several days. On Thursday near Nigel Pass, forecasters observed a small natural cornice fall trigger a size 1.5 Deep Persistent slab avalanche. This occurred on a steep, unsupported North aspect, at 2700m.

Confidence

Due to the number of field observations

Régions couvertes