Bulletin d’avalanche

Purcells

Apr 14 – 15, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

This bulletin was produced using limited data streams, and significant variations in snowpack structure are likely to exist. If you've been traveling in the backcountry, we'd love to hear from you. Observations can be sent to [email protected].

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Recent snowfall has most likely been redistributed by changing winds. Wind slabs exist on a variety of aspects at treeline and above. Wind has also formed very large and potentially unstable cornices

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    A layer of surface hoar is buried about a metre down, mainly on high northerly aspects. A surface avalanche stepping down, cornice fall, or the weight of a person from a thin-spot trigger point could trigger it.

Confidence

Fair - Due to limited field observations

Weather Forecast

A ridge of high pressure is expected to develop throughout the forecast period. Overcast skies and light convective flurried are possible on Monday giving way to a mix of sun and cloud on Tuesday and Wednesday. Generally light east/northeast winds are expected each day. Daytime freezing levels are meant to climb gradually from about 1000m on Monday to about 1600m on Wednesday.

Avalanche Summary

In recent days, explosives control has produced slab avalanches to size 2 on northeast facing slopes at 2600m and higher. These slabs likely failed on the early April surface hoar. Wind slabs to size 1.5 were also triggered on north facing alpine slopes. In general, observations have become very limited.

Snowpack Summary

Light to generally moderate snow accumulations from Friday night have been shifted by variable winds into windslabs which exist at treeline and above. In some areas ongoing snowfall throughout the weekend has produced overlying soft slabs.A surface hoar interface is buried within the upper metre of the snowpack, mainly on high-elevation northerly aspects. Although it may be gaining strength, these slopes should be treated with suspicion particularly in deep snowpack areas where the overlying slab is well developed. On other slopes, recent storm snow overlies a crust.

Régions couvertes