Bulletin d’avalanche

Kootenay Boundary

Dec 7 – 8, 2021Avalanche Canada
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Danger d’avalanche

Thu
Fri
Alpin
1 · Faible
Limite forestière
1 · Faible
Sous la limite
1 · Faible

Points saillants

Avalanche danger will gradually increase in wind-affected terrain this week.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5

    As wind increases on Tuesday and Wednesday we expect to see some unstable slabs forming on leeward terrain, especially along ridges. Wind slabs could be poorly bonded to the underlying crust.

Confidence

High - The snowpack structure is mostly striaghtforward and not unusually variable.

Weather Forecast

MONDAY NIGHT: Clear skies, no precipitation, light wind from the northwest, treeline temperatures around -12 C.

TUESDAY: Increasing cloud throughout the day, no precipitation, light to moderate wind from the southwest, treeline temperatures warm to -8 C.

WEDNESDAY: Flurries bring 5-15 cm of low density snow, moderate wind from the west, treeline temperatures around -10 C.

THURSDAY: Mostly cloudy skies, no precipitation, light wind from the southwest, treeline temperatures around -8 C.

Avalanche Summary

No avalanches were reported over the weekend, except for one explosive triggered storm slab involving recent snow above the crust.

Snowpack Summary

Up to 20 cm low density snow is poorly bonded to a widespread and supportive crust. Fun pockets of powder may be found in sheltered areas and depressions. The snowpack is generally well consolidated. At upper elevations a few crusts may be found in the lower snowpack, while at mid and lower elevations the entire snowpack was saturated and is now frozen and uniform.

Snowpack depths at treeline range from 50-110 cm, with alpine depths exceeding 120 cm in areas. Snowpack depths decrease rapidly below 1800 m.

Check out our latest Forecaster Blog here.

Terrain and Travel

  • Be alert to conditions that change with elevation and wind exposure.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

Régions couvertes