Boletín de aludes

Kananaskis

Dec 28 – 29, 2016Alberta Parks
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Archivado · caducó 10 years ago

Peligro de aludes

Thu
Fri
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
1 · Débil

Lo esencial

The weak mid pack will take some time to stabilize. Fresh snow loading, either by wind or new snow, will tip the scales towards an avalanche cycle. Avoid large terrain while the snowpack adjusts.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–2
    These continued to grow today. Whumphing and cracking was observed as forecasters approached windloaded areas at treeline. Thin to thick snowpack areas should be treated with caution.
  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    2–3
    Its thought that the windslabs are very likely to step down to this layer. Large avalanches are possible. Thin spots are now on our radar as trigger points for this layer. 

Confidence

-

Weather Forecast

Snow beginning Thursday afternoon or evening bringing 10 cm. The winds will continue overnight tonight, but taper slightly as the incoming weather passes. Expect SW winds at 40km/hr in the alpine tomorrow. Temperatures will range from -8 at the road to -10 at ridge top.

Avalanche Summary

One slab was noticed today below a large alpine cliff face. Sz 2(estimated, debris pile was not seen), E asp, 2500m. From a distance it looked about 60cm deep and 100m wide. Likely ran on the Dec 18th facets.

Snowpack Summary

The steady winds that we've been experiencing lately are significantly changing our snowpack. Windslabs are the current problem at the forefront of our minds. We are starting to see them even below treeline, however they are of little concern as there is still very little snow at valley bottom. Open areas at treeline is where the slabs start to become a legitimate concern. At the moment, the slabs as a whole are up 40cm thick. This thick layer is actually made up a series of laminated slabs from various wind events. These slabs are sitting on a delicate layer of facets that were buried on Deb 18th. This facet layer is widespread and will likely last for weeks to come. Snow depth at treeline was 125cm today. The alpine has a similar condition in terms of windslabs and weak layers underneath. We are finding the Dec 18th facets alive and well in most areas. In thinner snowpack areas, these facets are more pronounced and have turned into depth hoar. The snow coverage is variable with dramatic transitions. It will go from gravel to a meter deep snowpack in only a few steps. Wind loaded areas will have a surprising amount of snow in them.

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