Bulletin d’avalanche

North Rockies

Dec 4 – 5, 2023Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Carefully assess snowpack depth as you move through terrain. A rider triggerable storm slab could be present on slopes that are above threshold for avalanches.

Problèmes avalancheux

  • Storm Slabs

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

    New snow may have formed a storm slab at treeline and above. Surface hoar could exist in shelterd features at treeline making storm slab more reactive in those areas. The largest slab will be found on north/east aspects due to wind loading.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported in our region.

Please continue to submit MIN reports and support your backcountry community.

Snowpack Summary

Up to 30 cm of new snow has fallen on a a generally faceted upper snowpack. This new snow likely overlies surface hoar in sheltered terrain at treeline. On north and east facing slopes in the alpine new snow has formed wind slab.

The mid pack is generally unconsolidated. A crust with sugary facets beneath it can be found just above the ground.

The snowpack is still shallow for this time of year. Average snowpack depth at treeline range from 50 to 80 cm.

Weather Summary

Sunday Night

Mostly cloudy with up to 5 cm of new snow expected, south alpine wind 40 to 60 km/h, treeline temperature -3°C.

Monday

Cloudy with up to 10 cm of new snow expected, south alpine wind 40 to 70 km/h, freezing level rising to around 1400 m.

Tuesday

A mix of sun and cloud with up to 10 cm of new snow expected by late morning, southwest alpine wind 40 to 70 km/h, freezing level around 1600 m.

Wednesday

A mix of sun and cloud with trace amounts of new snow expected, southwest alpine wind  20 to 40 km/h, freezing level falling to 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

Régions couvertes