Bulletin d’avalanche

Jasper

Apr 12 – 13, 2017Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Unsettled weather for the next few days in the Icefields area. Local precip and accumulation may vary wildly from region and elevation.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Cornice failure is hard to predict but likelihood increases with sun, warm temperatures, and wind-loading.There are some very large cornices out there. Wise to give them a wide berth.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Isothermal conditions are possible as crusts break down by late morning. Gauge the extent of the overnight freeze relative to how quick it will move into being reactive.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    The deep instability could be triggered by large loads such as a cornice failure or a surface avalanche. Human triggering is most likely from shallow spots or on steep unsupported slopes.

Weather Forecast

Light flurries continue to scatter through the forecast area. Models calling for light but consistent precip, heaviest overnight Thursday. Thus far it remains variable in both location and accumulation. Expect warm alpine temps near 0 with freezing levels rising to 1800m.

Snowpack Summary

Inconsistent support on a weak melt freeze crust, solar aspects. Dryer surface snow on polar aspects over a solid mid-pack bridging the weak base above 2000m. The base is a combination of weak facets and depth hoar mixed around a Nov rain crust. A consistent melt-freeze cycle is occurring below tree line.

Avalanche Summary

Field team reporting some observed loose wet slides and snow-balling BTL. Visibility poor and no ALP observations.

Confidence

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

Régions couvertes