Bulletin d’avalanche

Jasper

Jan 16 – 17, 2021
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Archivé · expiré 6 years ago

Danger d’avalanche

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

The winds have redistributed the recent storm snow into windslabs well down into the terrain. Luckliy treeline and below has better skiing.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3

    Continued strong westerly winds in the alpine and exposed treeline have redistributed the snow well down into the terrain. 

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    Use caution around thin to thick areas where buried deeper weak layers could be triggered.

  • Loose Dry

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

    Ice climbers be wary of this problem as even small avalanches can quickly gain volume and have serious consequences. The storm slow remains loose and unconsolidated. Watch for triggers that would wake this up such as rising temperatures and wind.

Weather Forecast

Saturday: Mainly cloudy with isolated flurries. High -9. Wind W: 15-35 km/h

Sunday: Cloudy with sunny periods and isolated flurries.  Low -11, High -7. Wind W: 20 km/h gusting to 55 km/h.

Monday: A mix of sun and cloud.  Low -14 °C, High -9 °C. Mostly light ridge wind occasionally gusting to 35 km/h.

Snowpack Summary

January 13th brought upwards of 55cm of new snow in the region. It has settled to 20-30cm with mild temperatures with continued wind slab development. The alpine has had continued strong winds promoting wind effect, wind slab formation and cornice growth. The mid pack is supportive. Near the ground it is weak facets and depth hoar.

Avalanche Summary

No new avalanches observed since Wednesday. Wednesday's explosive control action had surprisingly little results. During and after Tuesday-Wednesdays' storm, a significant natural cycle up to size 3.5 was noted occurring mostly in the Alpine open features South through Westerly aspects.

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Confidence

Due to the number of field observations

Régions couvertes