Bulletin d’avalanche

Jasper

Mar 20 – 21, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Solar influence, overhead cornice failure or isolated loading or cross-loading will affect the localized hazard as we approach spring like conditions.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    First indicators of this problem showing up. Easy enough to avoid but, larger slides, triggered in the deep weaknesses can easily become a significant issue for groups traveling in the valley bottoms or run outs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3
    This problem may still be a concern in the Whistler/Portal Creek area. It appears to be inactive in the Maligne and Icefields areas.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Freezing level expected to remain at treeline throughout the next 48 hours, even overnight. Expect sluffing and loose wet activity during the heat of the day, particularly on solar aspects.

Weather Forecast

Mild temperatures with freezing levels remaining at treeline with poor overnight recovery (re-freezing). Light Southwest winds with light scattered flurries amounting to up to 10cm by Monday evening then tapering off. Temperatures expected to drop by Tuesday evening.

Snowpack Summary

The snowpack is generally shallow and poorly consolidated, significant variation exists within the forecasting area. The persistent slab may still be active in the Portal Creek area. This layer could be triggered from thin spots on the slope (trees, rocks, etc). Alpine wind slab is present on lee slopes. Springlike conditions below tree-line.

Avalanche Summary

Significant large avalanches reported for field teams in the Icefields area. Appear that the most significant of which have been triggered by cornice failure up to sz 3.5 in the Alpine in the past 72 hours.

Confidence

Régions couvertes