Bulletin d’avalanche

Jasper

Jan 5 – 6, 2022
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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

Points saillants

The current avalanche problems are variable across elevation bands and the forecast region. Dig down and investigate at all elevations before committing to avalanche terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2

    Variable wind directions have caused reverse loading. Strong to extreme winds in the past few days had a potential to create wind slabs farther down the slopes. Careful assessment is required with local terrain influences.

  • Persistent Slabs

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

    This layer is a rain crust up to 1950m and reactive to large loads. It could also be a problem layer above 1950m not as a crust but a density change interface. Typically this layer is down  around 40cm.

  • Deep Persistent Slabs

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

    Natural deep avalanches are getting less frequent yet it remains a low probability and high consequence event if you push your luck.

Weather Forecast

Wednesday

A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: High -17 C.

Light ridge wind.

Freezing level at valley bottom.

Thursday

Cloudy with scattered flurries.

Accumulation: 5 cm.

Alpine temperature: Low -20 C, High -12 C.

Ridge wind southwest: 15 km/h.

Freezing level at valley bottom.

Snowpack Summary

Up to 15 cm of new snow have been redistributed by strong SW then N winds. Cold temps continue to promote faceting. The mid-pack is supportive with the Dec 1st interface down 40cm as a rain crust below 1950m and possibly a density change interface above 1950m. Basal faceting continues near or on the ground.

Avalanche Summary

One large avalanche was reported by the public over an ice climb on Mt. Wilson. See the MIN report.

Confidence

Due to the number and quality of field observations

Régions couvertes