Bulletin d’avalanche

Jasper

Feb 11 – 12, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Remember a Moderate rating still means human triggering remains possible. A thick supportive mid-pack is critical to safe travel. Shallow snowpack areas are more prone to trigger. Ice climbers must be vigilant for loose dry avalanches in gullies.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5
    Expect sluffing out of steep rocky terrain. Cold temperatures will loosen the surface snow to the point where it loses structure and avalanches as a point release. They can pick up enough mass to be a concern.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3.5
    Just a reminder, this is still present and can still be triggered from shallow snowpack areas. See avalanche activity summary.

Weather Forecast

Monday will be a mix of sun and cloud, no precipitation, alpine temperatures high -15 C, and light ridge winds. Tuesday will be sunny periods with isolated flurries, trace precipitation, alpine temperature low -22 C and high -14 C with light ridge winds. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

50cm from Feb 2nd was followed by strong N winds and cold temperatures. This snow overlies a dormant but persistent weakness of surface hoar, crusts, and/or facets. Cold temps have weakened the structure of the slab over this layer and it's generally dormant, for now. A basal depth hoar weakness exists especially shallow areas.

Avalanche Summary

A flight from Jasper to Kinbasket lake on Sunday observed very little new activity. A natural slab avalanche (Sz 2.5) was observed on a NW aspect, 2400m above Maligne Lake on Saturday.On Feb 7th, a size 2 deep persistent slab was triggered by skiers in the Maligne area on a W aspect, 1950m, on a 30 degree slope.

Confidence

Régions couvertes