Boletín de aludes

Kananaskis

Apr 4 – 5, 2017Alberta Parks
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Archivado · caducó 9 years ago

Peligro de aludes

Thu
Fri
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Still some deep weak layers to be concerned with. And the transition to Spring has slowly begun - avalanche hazard will increase with solar radiation and daytime heating. Keep an eye on localized conditions.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Not much natural avalanche activity with these wind slabs yet, but human-triggering is more likely in convex and unsupported features. These slabs seem confined to the Alpine.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2
    The intense April sun is causing a rapid increase in loose wet avalanche activity on solar aspects as the each day progresses.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–4
    We know it sounds like a broken record, but this deep layer is still a threat in any avalanche terrain that has not yet had extensive previous avalanching. While there is a lower probability of triggering, the consequences are high.

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

Wednesday is expected to be mainly cloudy with no precipitation. Winds will be 30km/h from the SW at ridgetop with Alpine temperatures near -3 C. Freezing levels should reach 2200m. Thursday and Friday may be warmer yet and should see a bit of sun mixed with light flurries.

Avalanche Summary

One size 1.5 cornice failure occurred on Mt Buller in the past 24hrs, but the cornice did not trigger a slab on the underlying slopes. A few solar triggered loose wet avalanches up to size 2.0 were observed in steep Alpine and Treeline terrain today.

Snowpack Summary

A clear and cold night brought a good surface freeze to the snowpack overnight, but that changed quickly on steep solar aspects where snow was moist by late morning. Solar aspects have a variety of buried crusts, whereas polar aspects above 2100m have an average of 20cm of dry snow sitting on a variety of previous surfaces. Wind slabs are present everywhere in the Alpine except in sheltered features. Not much natural avalanche activity has occurred with these wind slabs, but many areas like ripe for human-triggering. As previously reported the mid-pack remains dense and strong, but the basal layers are very weak consisting of anywhere between 50 and 100cm of facets sitting on the ground. Forecasters still have low confidence for traveling in large Alpine terrain, unless there has been widespread previous avalanching.

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