Bollettino valanghe

Purcells

Jan 9 – 10, 2013Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

Fri
Sat
Alta quota
4 · Forte
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato

In sintesi

Very touchy conditions linger. Be aware of overhead hazard and how your position connects to slopes above.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–6
    The consistent strong winds mean that the windslabs extend lower into the terrain than normal.
  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–4
    Up to 60cm of storm snow has settled into a cohesive slab.

Confidence

Fair

Weather Forecast

Thursday: Expect mixed skies with some sunny breaks. Temperatures should reach -10 and winds turn to light northerlies.Friday & Saturday: A ridge dominates giving mixed skies, light northerly winds and cool alpine temperatures. Valley cloud is possible.

Avalanche Summary

Explosive and natural avalanches up to 2.0 were observed, predominantly windslab events on north through east facing slopes. Isolated remote and rider triggered slides have also been reported.

Snowpack Summary

The recent storm has brought up to 60cm of new snow to the region. Consistent southwesterly winds have redistributed the new snow (dramatically in some areas) to create widespread windslabbing on lee and open features in the alpine and exposed treeline. Where the wind has been strongest, we have reports of windslabs much lower on slopes than normal.There have been avalanches reported both within the storm layers as well as at the initial storm interface, the January 4th layer. This layer consists of small facets, surface hoar on sheltered treeline and below treeline areas and sun crust on steep south and west facing slopes. The bonds with the facetted snow are improving while the surface hoar / sun crust interface is weak. The midpack is well bonded and strong. The deep crust/facet combo from early November still exists and concern remains (although unlikely) for triggering this layer from a shallow spot.

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