Boletín de aludes

Northwest Inland

Jan 17 – 18, 2016Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Tue
Wed
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil

Lo esencial

Light snowfall with ongoing strong winds are expected to continue to build new wind slabs.  Use extra caution in wind-affected terrain and watch for signs of wind loading.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    New wind slabs are expected to form strong winds and light new snowfall continue.  Old stiffer wind slabs may also still be lingering around ridge crests.

Confidence

Low - Due to the number of field observations

Weather Forecast

Another weak storm pulse should bring 4-8cm of new snowfall Sunday overnight and early Monday. Alpine winds should be moderate to strong from the south and freezing levels are expected to be 500-900m. A mix of sun and cloud is expected for Monday afternoon before another storm pulse arrives Monday overnight or Tuesday morning. Another 3-6cm of snowfall is expected for Tuesday with freezing levels around 700m and moderate to strong southerly alpine winds. Unsettled conditions are expected for Wednesday with light flurries and sunny breaks both possible.

Avalanche Summary

On Saturday, a ski cut produced a size 1.5 wind slab avalanche on a SW aspect at treeline north of New Hazelton. No new avalanches were reported on Friday. On Thursday, a couple of size 2 wind slab avalanches were reported from steep northwest aspects in the alpine. These occurred in the upper Kispiox area and were typically 40cm deep slabs.

Snowpack Summary

The region has a mix of wind slabs and developing storm slabs. In higher snowpack areas in the northwest of the region, the storm slab has become reactive to human triggers. In most other areas the wind slabs are thin and stiff. Buried surface hoar is layered through the thin snowpack, and cool temperatures as well as limited loading have preserved these weak layers. The mid pack that was reported to be well settled may have now facetted in the shallower areas, and the deeper basal layers are almost certainly facetted and weak. We have not heard of any full depth releases on weak basal layers yet.

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