Bulletin d’avalanche

Yukon

Avalanche Canada
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Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 4 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

All melt, no freeze conditions are possible on Saturday. By Sunday morning, falling freezing levels should result in a strong refreeze and strengthen the upper snowpack.

Problèmes avalancheux

  • Wind Slabs

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

    At higher elevations, isolated wind slabs may persist in leeward terrain. A buried layer of surface hoar may exist beneath (30 to 80 cm deep) wind slabs on shaded, northerly slopes, immediately beneath ridge tops.

  • Loose Wet

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

    Wet loose avalanches may be possible on all aspects and elevations on Saturday with high freezing levels. As freezing levels drop by Sunday morning, this risk should become confined to south-facing and lower-elevation terrain.

Confidence

Low

  • We are uncertain about how the timing or intensity of warming will affect the snowpack.
  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.
  • We are uncertain due to a limited number of field observations.

Avalanche Summary

On Wednesday in White Pass, numerous recent natural wind slab avalanches up to size 2 were observed. A natural cornice failure (size 2.5) was also noted along a northeast ridgeline. Additionally, a larger avalanche (size 3) was reported on an east aspect, where a wind slab stepped down to a buried surface hoar layer.

If you’re heading into the backcountry, please consider submitting a MIN report—observations are particularly limited this time of year.

Snowpack Summary

Overall, expect typical spring conditions. Snow surfaces will soften through the day with warming temperatures and sun exposure, then refreeze overnight, leading to firm, crusty conditions in the morning. Higher-elevation, north-facing terrain may continue to hold pockets of dry snow.

Elevated freezing levels on Friday night may limit the overnight refreeze (especially at lower elevations), resulting in a weakened upper snowpack by Saturday morning.

The lower snowpack remains weak and faceted, particularly in areas with a shallow overall snowpack. Although unlikely, these layers could become more reactive during periods of above-freezing temperatures and/or intense solar radiation.

Weather Summary

Friday Night
Partly cloudy. 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2400 m.

Saturday
Mostly sunny. 10 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2300 m.

Sunday
Mix of sun and clouds. 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1300 m.

Monday
Mix of sun and clouds. Trace amounts of snow. 10 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Avalanche danger will increase as the surface crust breaks down.
  • Wind slabs are isolated, but may remain reactive.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Avoid areas with a thin or variable snowpack.

Régions couvertes