Boletín de aludes

Kananaskis

Feb 15 – 16, 2015Alberta Parks
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Archivado · caducó 12 years ago

Peligro de aludes

Tue
Wed
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

The SPAW issued by Kananaskis and the National parks has now been extended to Tuesday.  See www.albertaparks.ca or here for details.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–5
    Skier triggerrable windslabs are being observed in alpine areas as well as gullied and crossloaded features at treeline.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Cornices have grown over the past week and many large avalanches have been triggerred by cornice collapses.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    3–6
    Avalanches in the upper snowpack will likely step down to a deeper layer such as the Jan 30th or the Nov 6th or the weak basal facets.

Confidence

Good

Weather Forecast

Temperatures will be cooling over the next few days to more seasonal values.  Freezing levels will remain at lower elevation until wednesday when they are again forecast to climb up to 1800m.  The sun is gonna be in and out over the next while and it seemd to pack a punch in terms of solar radiation so keep an eye on overhead slopes that may be in the sun.

Avalanche Summary

A skier accidental sz 2.5 avalanche occurred late in the day on Saturday.  The slide occurred on an E aspect at 2400m, was 130m wide, up to 100cm deep and ran over 600m.  5 skiers were involved and one fatality resulted.  Yesterday several sz 2-3 avalanches were observed when the sun came out.  Some of the fracture lines were over 500m wide failing at what appeared to be the jan 31st interface down 50-90cm and some avalanches also stepped down to ground.

Snowpack Summary

A temperature crust from the recent heat can be found on all aspects up to 2200m then only on solar aspects up to 2400m. Easy to moderate sheers persist within the upper snowpack down 30-40cm. Extended column tests also indicate that this layer is prone to wide propagations. The Jan 31st interface is down 70-80cm but the bond at this interface seems to be improving. The basal layers in the snowpack area still weak and any avalanche that is triggerred will likely step down to these basal layers. Temperatures are cooling and freezing the previous isothermal snowpack at lower elevations.

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