Bulletin d’avalanche

Jasper

Dec 30 – 31, 2021
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Archivé · expiré 5 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Temperatures have moderated slightly on the Icefields Parkway but extra layers & a cautious attitude is still recommended.

Wind slab is our primary concern however deep persistent slabs have been triggered by cornices & surface avalanches recently.

Problèmes avalancheux

  • Wind Slabs

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

    Variable wind direction over the past week has caused reverse loading in many areas.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5

    Extra vigilance is warranted in steep terrain, ice climbs, and gully terrain traps where small avalanches can build into larger volumes.

  • Deep Persistent Slabs

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

    Recent avalanche observations have shown that deep persistent slabs can be initiated by large triggers such as surface avalanches or cornice failures. 

Weather Forecast

Thursday: A mix of sun and cloud. 

Alpine temp: high -20 C. Weak alpine inversion.

Wind: West 10km/h

Friday: A mix of sun and cloud.

Alpine temp: low -23 high -20 C. Weak alpine inversion.

Wind West: 10 km/h

Saturday: Mainly Cloudy with isolated flurries. Trace Precipitation

Alpine high -17

Wind South West 20km/h

Snowpack Summary

Cold temps are faceting the upper snowpack but pockets of wind slab are still present on all aspects at & above tree line. The mid-pack is supportive with the dec 1 crust interface down approx. 40 cm in most locations. Basal faceting continues below the Nov 5 crust potentially amplifying the deep persistent slab problem.

Avalanche Summary

A natural size 2.5 avalanche was observed on Mt. Wilcox during a road patrol today. Estimated date Dec 27th. This avalanche appears to have started as a wind slab, stepping down to deep persistent slab mid path. View min report here

Marmot Basin reported a similar observation with a natural cornice failure triggering deep persistent slab Dec 24.

Confidence

Régions couvertes