Bulletin d’avalanche

Jasper

Mar 29, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Spring conditions exist.  Now is the time to start early and finish early in the afternoon before the snowpack heats ups and starts moving.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Warm alpine temperatures will weaken the large cornices out there. Large loads have the potential to trigger the persistent slab weakness on loaded lee slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Large triggers such as cornice fall has triggered this weakness. We expect to see large avalanches on steep slopes with warm temperatures rising into the alpine and intense solar radiation.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Without a good overnight freeze, this problem will wake up by early afternoon.

Weather Forecast

The freezing level is expected to go above 2000m with light westerlies winds and mostly sunny skies.

Snowpack Summary

A 15 to 20 cm melt freeze crust on solar aspects below treeline appears to be maintaining its strength until late in the afternoon.  Isothermal conditions are beginning on shallow south facing slopes at treeline.  The alpine snowpack is relatively stable where it is thicker especially on polar aspects.

Avalanche Summary

Numerous wet loose avalanches were observed along the Parkway on all solar aspects from treeline to valley bottom.  Slides ranged from 0.5 to large 2 in size.

Confidence

Timing or intensity of solar radiation is uncertain on Friday

Régions couvertes