Bulletin d’avalanche

Jasper

Feb 7 – 8, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

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

Human triggering remains a possibility. Assess the stability before committing to avalanche terrain.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5
    Up to 50cm of recent snow followed by strong winds has built thick slabs. 

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5
    Expect sluffing out of steep rocky terrain if the sun is on it.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3.5
    New snow with strong winds recently overloaded the deep persistent weakness in shallow snowpack areas.

Weather Forecast

Thursday will be mainly cloudy with isolated flurries, trace snow, alpine temperature high -15 C, and 10km/hr west ridge winds. Friday will be cloudy with sunny periods and isolated flurries, alpine temperatures Low -31 C and High -16 C, and light East ridge winds. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

50cm from Feb 2nd was followed by strong Northerly winds. This snow overloaded; the Jan 18 persistent weaknesses such as surface hoar 10mm in sheltered areas at lower elevations, crust on steep solar slopes, and facets on Northerly alpine slopes; and the deep persistent basal facet and depth hoar weakness - particularly in shallow snowpack areas.

Avalanche Summary

Feb 4th avalanche control work at the Icefields produced several large size 2-2.5 persistent and deep persistent slab avalanches. A natural cycle of large slab avalanches occurred during this last storm but activity has tapered off.Help forecast - share observations HERE, on the Mountain Information Network!

Confidence

Due to the number and quality of field observations

Régions couvertes