Bulletin d’avalanche

Jasper

Apr 19 – 20, 2015Parks 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

Temperatures and solar radiation will  steadily increase the avalanche danger through the day on Monday and Tuesday. Start early and finish early.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Natural cornice failures are being observed daily. Pay attention to what is above you and avoid cornice exposed slopes.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    As temperatures warm up so does the potential for loose wet avalanches. It may be enough to trigger deeper basal layers increasing the consequences.

Weather Forecast

Monday and Tuesday will be progressively warmer. We expect good recovery on Monday night, but temperatures will continue to warm on Tuesday with the freezing level staying around 2400m into Wednesday. The weather is expected to deteriorate by Wednesday afternoon bringing some light precipitation with the warm temperatures.

Snowpack Summary

Pockets of wind slab are present in the upper alpine from previous strong winds last week. At treeline, lee aspects have a series of windslabs layered with thin weaknesses in the upper snowpack. A strong midpack bridges over weak basal facets on Northerly aspects at treeline and above.

Avalanche Summary

Several natural cornice failures to size 2.5 noted in the icefields area on North and Easterly aspects. Intense solar radiation will likely increase the cornice falls and initiate afternoon wet loose avalanche conditions in the next few days.

Confidence

Timing of incoming weather systems is uncertain on Wednesday

Régions couvertes