Bulletin d’avalanche

Jasper

Apr 29 – 30, 2017Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Mon
Tue
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

Spring conditions are here and fine skiing can be found at all elevations. Pay close attention to the freezing levels and plan to finish your day before the melt freeze crust breaks down and the afternoon avalanche cycle starts.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Cornice failures are more likely with warm  alpine temperatures.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Freezing overnight temperatures decrease this danger in the morning, it increases with daytime heating, sun and rain. Most widespread during the late afternoon on solar facing slopes. Sluffs from rocks can trigger large slides once the snow is wet.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    The deep instability is well bridged by a solid mid-pack; however, it could be triggered by a cornice failure.  This problem will transition to wet slabs as the snowpack warms this spring.

Weather Forecast

Cool, unsettled conditions will dominate through the weekend with isolated convective storms possible on Sunday.  Freezing levels are expected to hover around 1700 m overnight resulting in poor recovery on Sunday morning.

Snowpack Summary

Winter conditions exist in the high alpine on Northerly slopes with up to 20 cm of loose new snow sitting over a well consolidated upper snowpack. Spring conditions exist on all other aspects and elevations with a melt freeze crust that is dependent on overnight freezing conditions.  The snowpack is moist to wet snow to ground below this crust.. 

Avalanche Summary

Avalanche activity will increase after warm nights and/or with thermal inputs such as rain, solar radiation and daytime warming. The avalanche danger will be lowest after cold nights and strong crust formation and will increase into the afternoon and evening before sunset. Likely trigger spots are rocks, cliffy terrain and shallow snowpack areas.

Confidence

Régions couvertes