Bulletin d’avalanche

North Rockies

Apr 6 – 7, 2025Avalanche Canada
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Archivé · expiré last year

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Wet loose avalanches remain likely after sustained warmth and sun. The snowpack needs time to cool and recover.

New and reactive wind slabs are forming in the alpine on north aspect terrain.

Problèmes avalancheux

  • Wind Slabs

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

    New and reactive windslab will be found near and below ridge crests.

  • Cornices

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

    Warm temperatures may cause large, destructive cornice failures.

  • Loose Wet

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

    Wet loose avalanches are likely as warm temperatures persist.

Confidence

Moderate

Avalanche Summary

On Thursday, a few natural and rider-triggered triggered size 1-2 wind slabs were reported on southerly aspects in the alpine.

NOTE: Observations in this region are currently very limited.

Snowpack Summary

New snowfall of up to 10 cm overlies primarily moist surface conditions. Solar aspects and lower elevations will begin to develop a crust or still present as moist snow.

Below this, a 5 to 25 cm variable strength crust from last week's rain event is present. This is capping a moist upper snowpack.

A persistent weak layer from early March, 40 to 80 cm deep, most likely exists as surface hoar on sheltered north and east aspects in the alpine. Its distribution is variable, and there have been no substantial reports of recent avalanches, but it should still be considered when evaluating slopes.

Weather Summary

Sunday Night

Cloudy, 5 to 10 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature +5 °C. Freezing level falling to 1500 m.

Monday

Cloudy, 1 to 5 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Tuesday

Cloudy, 5 to 10 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1700 m.

Wednesday

Cloudy, 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid travelling on slopes below cornices.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.
  • Be careful as you transition into wind-affected terrain.

Régions couvertes