Boletín de aludes

South Okanagan

Dec 4 – 5, 2022Avalanche Canada
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Archivado · caducó 4 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Very few field reports for this forecast region, and a reactive layer of surface hoar in forecast regions to the east. Choose conservative terrain and investigate the bond of the new snow.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    Southerly winds have impacted snow at upper elevations, incoming northwest wind may reverse-load features. There's a lot of loose snow out there, expect fresh slabs to form where the wind picks up.

    Reports further east find a weak layer of surface hoar 40-60 cm below the surface (check out the Avalanche Forecast to the east) and have had extensive reports of whumpfing and cracking on this layer. We have limited observations this year, but this problem could be encountered in this Avalanche Forecast region. Keep an eye on the wind, slabs may quickly form wherever the wind encourages the fresh snow to bond; and with a weak layer of surface hoar below, reactive slabs may be more widespread, extend into treeline elevations, and be more reactive than expected in sheltered areas.

Confidence

Low

Avalanche Summary

No new avalanches have been observed or reported in this region. However, note that we have had very few field observations.

Snowpack Summary

Up to 30 cm of low-density snow covers older more settled snow. Southwest winds have left wind slabs at upper elevations. Down 40-60 cm is a melt-freeze crust from the middle of November. To the east, to the Columbia and Kootenay-Boundary Forecast regions, a layer of surface hoar (on a crust) down 40-70 cm has been quite reactive with extensive reports of whumpfing and cracking. This layer is likely found within this forecast region, but we need more field observations to determine its extent and sensitivity. Snowpack depths exceed 100 cm at upper elevations.

Weather Summary

Saturday night

Mostly clear. Light northeast wind. Treeline temperature low -12 °C, possible overnight inversion.

Sunday

Sunny and cold, possible inversion. Light northeast wind. Treeline temperature high -5 °C,

Monday

Clear, cold, and calm. Increasing northwest wind, treeline high temperatures -10 °C.

Tuesday

Cloudy and cold with isolated flurries. Northwest wind 20-40 km/hr. Treeline high temperature -12 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to the wind, once it starts to blow fresh sensitive wind slabs are likely to form.
  • Closely monitor how the new snow is bonding to the old surface.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.

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