Bulletin d’avalanche

Coquihalla

Mar 5 – 6, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

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

***Updated 6:40 due to more precip than expected at some stations***

New snow and wind could form reactive wind slabs atop a slippery crust.

Problèmes avalancheux

  • Wind Slabs

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

    Small wind slabs could form in exposed terrain with the arrival of new snow and wind.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Over a week ago, large avalanches were observed on a buried weak layer. This layer continues to give results in snowpack tests, indicating a lingering possibility of triggering.

Confidence

Moderate

Avalanche Summary

Since the warm weekend, wet loose avalanches up to size 2 were observed. Wet avalanches have become unlikely as surfaces refreeze.

No persistent slab avalanche activity has been observed since over a week ago in the Manning area.

Snowpack Summary

Light snow on Tuesday night will bury crusty surfaces on all aspects and elevations. Beneath, 10 to 20 cm of snow is sandwiched between the surface and another crust.

A weak layer of facets and/or surface hoar is buried 50 to 120 cm deep. This layer has not produced avalanche activity for over a week but snowpack test results continued to show results, particularly in the Manning area.

A crust from December, buried 1 to 2 m deep, has been observed to be breaking down.

Weather Summary

Tuesday Night

Cloudy with 5 to 15 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Wednesday

Mostly cloudy. 10 to 30 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1400 m.

Thursday

Mostly cloudy. 20 to 40 km/h northeast ridgetop wind. Treeline temperature -4 °C. Freezing level 1500 m.

Friday

Mix of sun and cloud. 20 to 40 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Triggering deep layers is more likely if the snow surface didn't freeze overnight.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

Régions couvertes