Boletín de aludes

South Rockies

Mar 16 – 17, 2015Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

If solar radiation is strong on Tuesday, the Avalanche Danger may rise to High. Be conservative in your terrain selection as the snowpack adjusts to the shock of recent heavy rain, snow, and now sun.

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–4
    Heavy snowfall on Sunday has created deep new storm slabs which will likely remain sensitive to human triggering, especially in higher elevation lee terrain. Recent snow and wind has also created weak and fragile cornices.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    The new snow may fail as a pushy loose wet avalanche when it sees direct sunlight for the first time. Keep your eye on the thermometer and watch your overhead hazard as these avalanches may travel long distances and entrain mass quickly.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Tuesday

Weather Forecast

Mostly clear skies are forecast for Tuesday as a ridge of high pressure strengthens. On Tuesday night and Wednesday, expect light snowfall (up to 10cm) as a weak front spreads moisture to the region. On Thursday, the region should see a mix of sun and cloud with possibility of snowfall towards the end of the day. Winds should remain generally light, ramping up to moderate from the southwest as Thursday's system rolls in. Freezing levels should hover around 1800m on Tuesday, 1900m on Wednesday and 2000m on Thursday.

Avalanche Summary

At the time of publishing this bulletin no new avalanche activity had been reported. My best guess is that there was a healthy round of storm slab activity in response to all the new snow and wind on Sunday. Looking forward, I`m sure the new storm slab will remain sensitive to human triggering in high elevation, wind-exposed terrain. Also, sun on Tuesday will likely spark a round of loose wet/ wet slab avalanche activity on steeper, sun-exposed slopes.

Snowpack Summary

Heavy rain (up to 60 mm) on Saturday soaked the snowpack. On Sunday the rain changed to snow as the freezing levels slowly dropped. Heavy snowfall (up to 50cm) combined with strong southwest winds developed new storm slabs on all aspects in the alpine and at treeline. The most prominent snowpack feature is a thick crust 10-30cm below the recent storm snow extending up to around 2200m elevation. Below this elevation the crust is effectively capping the snowpack, preventing riders from stressing deeper persistent weak layers. In high alpine areas where the crust is not present or is less thick, dormant persistent weak layers may still be lingering and could wake-up with recent heavy loading or strong warming.

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