Bulletin d’avalanche

Kootenay Boundary

Avalanche Canada
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Danger d’avalanche

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

Points saillants

Strong sun and warming will increase the likelihood of both natural and human-triggered avalanches.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5

    Cornices are more likely to fall as the temperature rises and the sun comes out.

  • Storm Slabs

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

    Where powder snow prevails, check the bond of the new snow to old surfaces, especially around ridgelines or steep entrances. Warm temperatures may also increase the cohesion and reactivity of lingering slabs.

  • Loose Wet

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

    The likelihood of wet avalanches will increase under direct sun and rising freezing levels. The snowpack can rapidly destabilize under intense warming, and quickly produce distructive avalanches.

Confidence

Moderate

  • We are uncertain due to a limited number of field observations.
  • We are uncertain about how the timing or intensity of warming will affect the snowpack.

Avalanche Summary

Loose wet avalanches to size 1.5 were observed on southerly slopes around Kootenay Pass on Friday.

Strong sun and warming will increase the likelihood of both natural and human-triggered avalanches. Be increasingly cautious as the snowpack warms up and weakens.

This region is data sparse. Please consider submitting a MIN to let us know what you're seeing out there.

Snowpack Summary

Sun and rising freezing levels will turn snow moist during the day, warm temperatures overnight will prevent a crust from forming.

Where dry snow prevails. 15 to 50 cm of recent storm snow sits on moist snow around treeline or likely on a crust in the alpine. In some areas east of Nakusp, small, weak facets have been seen on the crust.

The snow also fell with moderate to strong winds, forming deeper deposits in lee terrain features. Below 1500 m, all this precipitation fell as rain, wetting an already wet and melting snowpack.

The remainder of the snowpack is strong.

Check out this Conditions Update for tips on managing the current spring conditions.

Weather Summary

Saturday Night

Clear skies. 20 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 2200 m.

Sunday

Sunny. 20 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level 2600 m.

Monday

Sunny. 20 km/h southwest ridgetop wind. Treeline temperature 7 °C. Freezing level 3000 m.

Tuesday

Mostly sunny. 20 km/h southwest ridgetop wind. Treeline temperature 9 °C. Freezing level 3200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Even brief periods of direct sun could produce natural avalanches.
  • Investigate the bond of the recent snow before committing to your line.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

Régions couvertes