Boletín de aludes

South Rockies

Feb 27 – 28, 2012Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

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

Check out the forecasters blog on managing the current hazard:http://bit.ly/sF10fT

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–5
    Previous windslabs are getting buried by dry light snow. New windslabs may develop from forecast west/southwest winds.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    2–6
    The weak layer of buried surface hoar, facets, and crusts continues to be triggered by light additional loads. Avalanches are expected to get larger as the slab above settles and consolidates. This weak layer may propagate into low angle terrain.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Light dry snow that fell over the past few days has been sloughing in steep terrain and running far and fast.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Wednesday

Weather Forecast

Tue: Clear skies. Alpine Winds Mod, increasing to Strong in the afternoon, W/SW. 1500m Temp: H: -2, L: -11Wed: A low pressure system tracks S of the int'l border, but should deliver 5 -10 cm's to the So. Rockies throughout the day. Alpine winds Strong West. 1500m Temp: H: -0, L: -15

Avalanche Summary

No avalanche activity reported, but, I suspect there was a fair amount of activity Monday as the snowpack adjusted to it's new load.

Snowpack Summary

Saturday night into Sunday, moisture in the west of the region collided with cold air in the east and resulted in an intense period of heavy snowfall that was very low density. This new snow has likely settled a bit with daytime warming Monday. Now 50-60 cm of recent snow sits on a highly reactive weak layer of crusts, surface hoar and facets. At 1950 metres elevation we have some snow pack test results from Friday that show that the 40 cm slab of snow above the February 8th weak layer is sliding with easy to moderate forces applied and it is propagating widely with either sudden planar or sudden collapse characteristics. The slab is reported to be less consolidated on northerly aspects than it is on southerly aspects. In areas further north, less snow has fallen on this interface--in the northern Elk Valley for instance, only around 15-20 cm lies above this interface. In lower snow areas, avalanche activity will likely lag behind higher snow areas, except for areas which have seen significant wind transport. In general, the mid-pack is quite strong in most locations. However, lingering concern remains for basal facets, particularly in shallower snowpack areas with steep, rocky start zones.

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