Boletín de aludes

Banff Yoho Kootenay

Feb 14 – 15, 2014Parks Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Fri
Sat
Alta montaña
4 · Fuerte
Límite del bosque
4 · Fuerte
Bajo el límite
3 · Notable
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Lo esencial

Avalanche conditions are `touchy` and the overall hazard is on the rise. Expect this trend to continue through the weekend. SH

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–3
    Winds will be forming slabs in the lee of ridge crests and exposed areas. These will be likely lying over facets or hard surfaces.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–3
    Touchy slabs are building and stiffening over a combination of facets, surface hoar, and sun crust on solar aspects. As the stiffness of the slabs increases, so too will the distance they propagate.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2
    The basal depth hoar has been gaining strength and is lying dormant. We are waiting to see if this layer ``wakes up`` in thin snowpack areas this weekend with the new snow load.

Weather Forecast

Light gusting strong Westerly winds and 5cm forecast for Friday. 5cm on Sat then up to 20 cm with strong winds for Sunday. We expect the hazard to slowly increase during the weekend. Temperatures will be mild.

Snowpack Summary

Treeline storm snow amounts are 50cm in Kootenay and Yoho,35cm in the Sunshine area, and 20cm in the Louise/Hwy 93N areas. Winds,warm temps causing slab development in exposed areas,which overlies a complex layer of facets, surface hoar and sun crust on solar aspects. Below this a generally well settled midpack overlying the basal depth hoar layer.

Avalanche Summary

Field trip to Kootenay saw numerous naturals at all elevations to size 2.5 occur within the last 24 hrs. Forecasters were able to ski cut size 2`s which were low density slabs along ridgetops on the Jan 30th surface hoar. These were running 100-300m and were on average 30-40cm deep. Smaller slides were observed in other areas with less storm snow.

Confidence

Due to the number and quality of field observations on Thursday

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