Bulletin d’avalanche

Jasper

Apr 5 – 6, 2013Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Monitor the weather changes throughout the day. Modify your travel routes if any significant elements of weather occur, such as extended sunny periods or heaven forbid, rain.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    These heavy and unstable features can fall unexpectedly triggering deep large avalanches.  Pay attention to overhead hazards when selecting your up track  and your descent route.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Additional snow coming overnight may provide the load to start a slide on this layer.  Slab bonding is expected to be touchy on the current sun and temperature crusts.  Expect to see this type of activity in steep rock gullies.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    If sunny, pay close attention to the increasing air temperature and the thickness of the melt freeze crust. Rain events will increase the elevation, range and aspect of this hazard.

Weather Forecast

Light to moderate snow flurries are expected to continue through the day on Saturday as a cold front moves through the area. Winds will gust to moderate from the Southwest in the late afternoon followed by a drop in temperature into the evening. Sunday will return to no snowfall and high diurnal temperature variations through the day.

Snowpack Summary

Below Treeline a supportive 15cm melt freeze crust provides temporary stability above a wet and unconsolidated snowpack. The crust thins with elevation and on slopes which are not South facing. By mid afternoon, or earlier on very hot days, this crust will melt and the avalanche danger will elevate considerably. The base of the snowpack is weak.

Avalanche Summary

Today, several loose avalanches were observed with the new snow, from steep rock cliffs.  Alpine and treeline locations were not visible in the icefields area. Steep, Southerly aspects below 1600m are mostly melted out. 

Confidence

Forecast snowfall amounts are uncertain on Saturday

Régions couvertes