Bulletin d’avalanche

Jasper

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

Danger d’avalanche

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

After a brief lull in the the weather on Wednesday, strong winds and precipitation will return on Thursday increasing the avalanche hazard.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5

    Even though the winds have died down there are lurking windslabs  from previous winds in lee and cross loaded features. 

  • Deep Persistent Slabs

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

    60-80cm of storm snow from Nov 13-15th has settled over a series of crusts and weak snow crystals at the base of the snowpack.

Weather Forecast

Tonight: Clear periods.

Alpine temperature: Low -13 C.

Ridge wind west: 10-30 km/h.

Wednesday: Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -11 C.

Ridge wind southwest: 20-40 km/h.

Thursday: Flurries.

Accumulation: 8 cm.

Alpine temperature: Low -12 C, High -7 C.

Ridge wind southwest: 20 km/h.

Snowpack Summary

Previous strong SW winds stripped all aspects in the alpine. New snow with warm temperatures and moderate winds have likely create new wind slabs. Above freezing temperature to 2000m will likely result in a future crust. A 1-2cm thick crust 80cm down is found up to 2500m. Below this crust are more crusts or facets depending on elevation.

Avalanche Summary

No new avalanches were observed on Monday.

Confidence

Due to the number and quality of field observations

Régions couvertes