Bulletin d’avalanche

Jasper

Feb 14 – 15, 2017Parks Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Warm alpine temperatures and flip-flops in the valley bottom. Rapid settlement of an already stressed snowpack likely to prolong this very active avalanche cycle. 

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Hard touchy windslab in the alpine and open tree-line features showing very serious potential for wide propagation in connected features.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Avalanches initiated within the storm snow may step down to deeper layers and in some cases gouging to ground in thin snowpack areas.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    30-40cm of storm snow has formed a touchy storm slab.

Weather Forecast

SW-ly winds expected to again increase to moderate values for Tuesday with the arrival of the warm moist air. Alpine temps forecast to be near freezing with a mix of sun and cloud. Precip expected in the middle of the week with freezing levels to 2100m.

Snowpack Summary

Hard surface windslab in the alpine and open tree-line features. Recent HST in sheltered locations at tree-line and below forming a cohesive soft slab over a faceted mid-pack with only marginal support below tree-line. This is all sitting on a weak base of large facets and depth hoar to create an overall delicate and untrustworthy snowpack.

Avalanche Summary

Avalanche control on the Icefields Parkway and Maligne Lake road. Loaded lee features showing impressive propagation character up to size 3 in alpine targets. Previously controlled slopes two days prior were reloaded and ran again to size 2.5; burying the road more than a meter deep. 

Confidence

Régions couvertes