Bulletin d’avalanche

Jasper

May 2 – 3, 2017Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Thu
Fri
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

Progressive warming and no overnight freeze is forecasted for the week of May 3 through to May 5th. Widespread avalanche cycle is expected. Check Alberta511 for up to date road closures on Maligne road and Hwy 93 for Wednesday through Friday.

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.

Confidence

Weather Forecast

Rapid progressive warming expected by Wednesday evening and leading into the weekend. Mix of light precipitation and broken skies. Expect strong radiation with any direct sun. Freezing level rising to 3000m by midnight on Wednesday.

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.

Régions couvertes