Bulletin d’avalanche

Jasper

Feb 17 – 18, 2017Parks Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Use caution and conservative terrain choices if venturing into newly opened  back-country areas. The snowpack is weak and touchy and we have had no field teams or snowpack reports in these areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    The new snow has buried and is adding to last weekend's windslab in the alpine and open tree-line features.  These slabs are showing the potential for wide propagation in connected features.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Avalanches initiated within the storm snow may step down to deeper layers and in some cases gouging to ground in thin snowpack areas.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Isothermal conditions expected in valley bottoms.

Weather Forecast

Temperatures are to drop below freezing tonight and remain there through the weekend.  5 cm new snow with moderate SW winds possible overnight, winds are forecast to ease to light by tomorrow afternoon.  Expect a cloudy weekend with a few light flurries.

Snowpack Summary

Isothermal conditions are being reported below tree-line.  10-15 new snow has fallen on previous hard windslab in the alpine and open tree-line features. In sheltered locations tree-line and above, the new snow is adding to a cohesive soft slab that is sitting over a weak and faceted mid-pack. The snowpack is delicate and untrustworthy.

Avalanche Summary

Late this afternoon, small loose wet avalanches were being reported below tree-line on steep rocky terrain.  Surprisingly, little other activity was observed or reported today.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

Régions couvertes