Bulletin d’avalanche

Jasper

Jan 19 – 20, 2014Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Cooler temperatures are incrementally improving stability. Careful snowpack evaluation, cautious route finding and conservative decisions should be your mantra. Shallow spots will remain the likely trigger spots.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Wind slabs of variable thickness and hardness dot the landscape. Many windpressed and stripped features will be encountered once you leave the shelter of the trees. Triggering this could dig down to the basal facets increasing the consequence.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    The basal facets are weaker below tree line as many whumphs noted. Where the snow is deeper at higher elevations, the mid-pack is bridging the weak basal facets; however, snowpack depth varies so much that its hard to inspire confidence in stability.

Weather Forecast

-12 Sunday night followed by clear skies, light west winds, and daytime temperatures ranging from -5 to -11. Monday to Wednesday will be scattered clouds and temperatures from -2 to -10.

Snowpack Summary

Warm temperatures are promoting settlement. BTL is a little more supportive but it remains the weakest of our elevation bands as not much bridges the basal facets. TL and above, wind slabs are present. Stability tests range from very easy to moderate sudden collapse on the basal facets.   

Avalanche Summary

Visibility was excellent on Saturday. A couple lower elevation solar facing steep gullies slid to size 2 but otherwise, little else noted. Thursday's control work on the Icefields Parkway yielded large avalanches to size 3 on all alpine aspects releasing on either the storm snow interface or on basal facets.

Confidence

Régions couvertes