Bulletin d’avalanche

Kananaskis

Apr 7 – 8, 2018Alberta Parks
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Archivé · expiré 8 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Spring weather conditions are slowly starting to transform the snowpack. Avalanche danger will rise rapidly during periods of intense solar radiation and rising freezing levels.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs are being encountered along ridgelines in alpine terrain. Watch for surface and near-surface slabs in lee and cross-loaded features. Incoming snow, wind and warm temps will add to this problem.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5
    Cornices are large and looming. When the solar radiation is strong and/or the air temperature rises, cornice collapses could be a major concern.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The March 15th melt-freeze crust, buried 30-50cm on solar aspects, could be an issue on bigger slopes, particularly in the Alpine. Evaluate the snowpack for the presence/absence of this problem layer before committing to a terrain feature.

Avalanche Summary

A few loose wet avalanches up to size 1.5 occurred this afternoon on steep solar aspects.

Snowpack Summary

Warm temperatures and mostly sunny skies on Saturday led to moist snow on solar aspects at all elevations and at lower elevations on polar aspects. Wind slabs in the Alpine are highly variable in distribution and density, but are most commonly found near ridgelines in lee and cross-loaded terrain. On steep solar aspects in the Alpine there is a 30 to 50cm thick slab overlying the March 15th crust, and though this condition is not widespread there has been some avalanche activity associated to this problem recently. Cornices are large, are feeling the heat of the April sun, and should be avoided.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

The region could see 5cm of new snow overnight, with Sunday bringing a mix of sun and cloud and isolated flurries. Temperatures are a bit milder than we have had recently with highs in the Alpine of -4 °C and the freezing level near 2200m. Winds will be moderate from the west. Conditions will remain unsettled into the early part of the week.

Régions couvertes