Bulletin d’avalanche

Lizard-Flathead

Mar 21 – 22, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs.

Triggering will be most likely in wind affected terrain.

Problèmes avalancheux

  • Storm Slabs

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

    15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs.

    Expect strong solar radiation to increase the likelihood of triggering slabs.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–1.5

    Expect strong solar radiation to trigger small wet loose avalanches and increase the likelihood of triggering slabs.

Confidence

Moderate

Avalanche Summary

On Thursday, a few naturally triggered storm slabs up to size 1.5 were reported on northerly and easterly aspects at treeline and above.

Snowpack Summary

15 to 25 cm of recent snow and southwest wind have formed fresh storm slabs that may be reactive to human triggers.

60 cm of recent snow sits on a melt-freeze crust, except for high-elevation north and east-facing slopes.

A persistent weak layer of surface hoar or facets from late January is buried 100 to 150 cm. Rocky slopes with a convex shape on northerly and easterly facing aspects at treeline and above are the most likely places to trigger this layer.

The lower snowpack is generally well-settled and strong.

Weather Summary

Friday night

Cloudy with 3 to 10 cm of snow. 15 to 30 km/h west ridgetop winds. Treeline temperature -5 °C. Freezing level valley bottom.

Saturday

Mix of sun and cloud with 0 to 5 cm of snow. 10 to 20 km/h west winds. Treeline temperature -4 °C. Freezing level 1600 m.

Sunday

Cloudy skies. 30 to 40 km/h southwest ridgetop winds. Treeline temperature -2 °C. Freezing level 1800 m.

Monday

Mostly cloudy. 30 to 40 km/h west ridgetop winds. Treeline temperature 3 °C. Freezing level rapidly rising to 2400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Even brief periods of direct sun could produce natural avalanches.

Régions couvertes