Bulletin d’avalanche

Jasper

Nov 29 – 30, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Ice climbers should beware of temperature inversion conditions on steep solar exposed climbs that are producing large avalanches.  Avoid these areas until temperatures cool on Monday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    North winds have formed wind slabs on isolated terrain features at upper elevations.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Temperature inversion continues with cold valley bottom temps and above freezing temps at treeline and above.  Warm temps combined with solar effect on steep gulley features are producing loose snow releases. This will be a concern to ice climbers.

Weather Forecast

Inversion conditions to continue on Sunday with freezing levels between 2100 and 3000m.  The inversion weakens on Monday.  Winds remain light, with cold temperatures overnight in valley bottoms. No precipitation until late next week.

Snowpack Summary

Previous frigid temperatures have weakened the snowpack. Whumphing noted on pockets of windslab in exposed areas around treeline. Alpine is scoured in wind exposed areas. Surface hoar formation and faceting is widespread. Warm temps in past 48hrs producing thin sun crust on solar aspects at treeline and above.

Avalanche Summary

Numerous loose dry avalanches up to size 2.5 noted on Saturday afternoon in steep solar facing gulleys between 2100 and 2700 m.  Whumphing observed in open areas at treeline on windslab.  No avalanche propagation observed but possible on steeper slopes.

Confidence

Freezing levels are uncertain on Monday

Régions couvertes