Bulletin d’avalanche

Jasper

Jan 21 – 22, 2020Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Significant wind effect and cornice growth observed in the region, but no natural activity.

Problèmes avalancheux

  • Wind Slabs

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

    New wind slabs at ridgetop along with cornice growth.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Cold facetting has weakened of the snowpack and compromised the bridging strength. Potential for triggering these deeper layers could increase as temperatures warm.

Weather Forecast

The arctic front has now retreated to the far north of BC.  An upper ridge is expected to pass through. Warm air continues to invade overtop and through the mountains. For more info: Avalanche Canada Mountain Weather Forecast

Snowpack Summary

Settled snow becoming more cohesive over previous surfaces, mostly facets. The upper snowpack has facetted and weakened; this is more pronounced in shallow HS areas where less than ~60cm. Inconsistent mid-pack bridging over the basal facets and DH. HS average at TL: ~135cm.

Avalanche Summary

Control work on the Icefields Parkway today produced soft slab to size 1.5 on low elevation targets. Significant warming at low elevations producing snowballs and pinwheels on solar aspects. A wet slab (size 2) released below treeline (1400m) and schmooed (definitely a technical term) onto the road at Medicine Lake late this afternoon.

Confidence

Freezing levels are uncertain on Friday

Régions couvertes