Bulletin d’avalanche

Jasper

Mar 11 – 12, 2015Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

A change in weather such as extended sunny periods, rain or warm overnight temperatures will increase the avalanche danger.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Previous moderate SW winds have created slabs on sheltered aspects and cross loaded features in the alpine.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Overcast conditions and high freezing levels will prevent any overnight refreeze of the snow pack at lower elevations. As such, solar aspects BTL could be prone to loose snow slides whenever the sun makes an appearance.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Natural and human triggering is unlikely but it is still a good practice to avoid steep, open, rocky slopes with a shallow snowpack.

Weather Forecast

Up to 10 cm of snow is expected through to Saturday in the Icefields area. Freezing levels are forecast to stay near 2000m overnight which will produce poor recovery in valley bottoms leading to additional melting and isothermal conditions.

Snowpack Summary

A supportive mid pack consisting of rounded and facetted layers is bridging the weak depth hoar/facet layers that make up the lower snowpack. Wind slabs have formed in sheltered alpine locations from moderate to strong SW winds. Below treeline, poor overnight recovery has created isothermal conditions in valley bottoms.

Avalanche Summary

One size 2 SL was observed in the alpine in the Saskatchewan river valley as well as several loose size I avalanches on solar aspects.

Confidence

Intensity of incoming weather systems is uncertain on Thursday

Régions couvertes