Bulletin d’avalanche

Banff Yoho Kootenay

May 2 – 3, 2014Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Winter is back at the higher elevations with cooling temperatures and 5-10cm of new snow forecast for each of the next few days. Watch carefully for rising temperatures as any increase in freezing levels will result in an increased danger rating.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The new moist snow will form small storm slabs and wind slabs in the alpine. This will settle out quickly but use caution in steep terrain until things cool down and the new snow has a chance to bond.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    This will be most prominent at lower elevations and on any solar aspects with daytime warming. Travel early when things are cool and avoid traveling in avalanche terrain later in the day.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    As temperatures cool in the alpine the likelihood of triggering the deep facets layers will decrease. Tree line areas received the most rain and will take longer to cool down and heal. Avoid exposure to large avalanche paths until this cycle is over.

Weather Forecast

Light North winds with periods of snow and accumulations between 5-10cm are expected over the next three days.  Alpine temperatures will drop to between around -5'C to -10'C overnight with day time highs hovering at or just above the freezing level. Freezing levels are forecast to remain near the 1900m level.

Snowpack Summary

Rain to tree line this morning followed by 5-10cm of wet snow with greater accumulations in the alpine. Below tree line the snowpack is mostly isothermal and rain soaked. Thin areas at tree line and above are also becoming isothermal.  Avalanches are occurring on the the deep persistent weak layers of facets and depth hoar during this warm spell.

Avalanche Summary

Numerous loose wet slides to size 2.5 and deep slab avalanches to size 3 failing on the basal facets have been observed over the past 24 hours on all aspects and at all elevations.  The majority of the deep slabs are occurring in thin steep rocky ground in the alpine.  Several recent cornice failures up to size 2 have also been observed. 

Confidence

Freezing levels are uncertain

Régions couvertes