Boletín de aludes

Banff Yoho Kootenay

Jan 4 – 5, 2014Parks Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Sat
Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Watch locally for N/NW winds in the next 24 hours. It wont take much to cause the hazard to go to High at upper elevations. We still have an overall weak snowpack, and have low confidence in bigger terrain. Ski quality is good in sheltered areas.SH

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    2–3
    Watch for areas of wind loading or open areas with wind effect. If a wind slab is triggered it may step down to the weak basal layers. The new snow will be hiding these wind slabs in many areas.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    The 20-30 cm of new snow can be expected to slough with any wind that occurs over the next 24 hours. Ice climbers should especially watch for sloughing in steep gully features and terrain traps.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    2–3
    This is the main layer of concern. Full depth avalanches on the basal depth hoar and crust have been occurring every day in the last week. The new snow has added stress to this layer, and will be easiest to trigger this layer in thin snowpack areas.

Weather Forecast

A N/NW flow with light - mod. winds will dominate for the next few days, with temperatures cooling to -15C Friday night. Expect a clearing trend with a trace of snow Friday night and none expected for the weekend

Snowpack Summary

20-30cm fell(tapering off to the W) in the last 24 hours, with little wind effect overall. 100cm at treeline on average. This new snow overlies previous wind slabs which sit over the basal depth hoar/ crust. Mod compression results found today at treeline on Hwy 93.N, collapsing in the depth hoar. More supportive midpack W of the divide.

Avalanche Summary

Numerous avalanches to sz. 2.5 stepping to ground were observed in the alpine today on numerous aspects, but a widespread avalanche cycle did not occur (probably due to lack of wind). A size 2 poured over Pilsner Pillar on Mt. Dennis and left of Silk Tassel on Mt. Field. We have been seeing isolated slides like this every day for over a week.

Confidence

Due to the number of field observations on Friday

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