Boletín de aludes

Cariboos

Dec 12 – 13, 2012Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

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

Lo esencial

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–5
    Expect buried windslabs in sheltered area and newly formed windslabs in exposed lee slopes and cross-loaded gullies below ridge crests.
  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    3–7
    Be extra careful in areas where ground roughness is not present to act as anchorage. Smooth ground cover areas include firn on glaciers, grassy slopes and rock slabs.

Avalanche Summary

Several natural slab avalanches up to size 2 have been reported on various aspects in the storm snow. A few skier triggered loose dry avalanches have also been reported on steep terrain.

Weather Forecast

A weak system will cross the region during Thursday and bring light precipitations and moderate to strong winds from the South West. Temperatures will stay cool for the entire period. Friday should see some sunny periods with lighter winds from the North West. Later Saturday, another upper trough is expected to spread moderate snow accumulations over the region with moderate winds from the South.

Confidence

Fair - Due to limited field observations

Snowpack Summary

30 cm of fresh snow has been transported by West and South West winds in the alpine and treeline  creating the windslab problem on lee slopes. It has been reported that these windslabs are reactive under the weight of a skier. In sheltered areas, this new snow could also be burrying older and deeper windslabs in the alpine. Sluffing is still an issue on steep features protected from the wind below treeline. Below treeline, also watch for early season obstacle, such as stumps and creeks. The deep persistent instabilities (surface hoar and early November crust) located in the middle and near the bottom of the snowpack are still a concern in this region, however, we haven't had report of their sensitivity or reactiveness. Digging down and making your own observations will be critical to safe slope selection. Any observations from the field are welcome at [email protected].

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