Bulletin d’avalanche

Jasper

Apr 24 – 25, 2021
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Archivé · expiré 5 years ago

Danger d’avalanche

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

Points saillants

Be wary of solar aspects late in the day when crusts may begin to break down.

Click the "More Spring Conditions details" link below for more info on the varying spring condition scenarios.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3.5

    These features are large, dense and heavy and will possibly trigger the deeper instability on the slope below. If you must travel near or below cornices, use good travel techniques and group management to reduce exposure.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    Shallow snowpack areas in the alpine and some treeline locations have the potential for human triggered and natural avalanches stepping to deeper layers if you get it wrong. This will most likely be a problem shallow northerly alpine terrain.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5

    Start early to avoid this problem. Cooler temperatures, cold nights, chilly winds and intermittent cloud cover will make this less of a concern the next couple of days. Be vigilant for an increase in activity if the sun makes an appearance.

Weather Forecast

Sunday: Cloudy with sunny periods. Precipitation: Nil. Alpine temperature: High -3 °C. Ridge wind light to 25 km/h. Freezing level: 1800 metres. Monday: Sunny with cloudy periods. Precipitation: Nil. Alpine temperature: Low -6 °C, High -1 °C. Ridge wind west: 15-35 km/h. Freezing level: 2100 metres.

Snowpack Summary

Expect a trace on a supportive melt-freeze crust on all aspects and elevations except for most high Northerly where it may be dry and powdery. The mid-pack is thick and supportive. Weak faceted crystals linger at the bottom of the snowpack and remain a concern particularly in shallow snow-packs or northerly alpine aspects.

Avalanche Summary

No patrol occurred on Saturday and nothing new was reported. Avalanche activity has tapered off with good overnight freezing, cooler daytime temps and less solar input.

Confidence

Régions couvertes