Boletín de aludes

Purcells

Mar 19 – 20, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

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

Variable snowfall amounts are expected on Wednesday. Correspondingly, there may be quite a lot of local variation in avalanche danger.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–7
    Storm snow, wind loading or cornice fall may overload a persistent weakness buried in the upper snowpack. This could lead to surprisingly large avalanches.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–6
    New storm slabs are likely to develop during Wednesday’s storm. Lee loaded slopes may be particularly touchy.

Confidence

Fair - Forecast snowfall amounts are uncertain for the entire period

Weather Forecast

Wednesday: Moderate to heavy snow (15-25 cm, mostly in the west). Strong SW winds. Alpine temperature near -4.Thursday: Light snow. Moderate W winds. Alpine temperature near -14.Friday: Light snow. Light winds. Alpine temperature near -12.

Avalanche Summary

On Monday, skiers triggered several small soft slabs and sluffs on wind-loaded or steep terrain. Explosives testing triggered three large (size 2-3) slabs within the storm snow. On Sunday, a natural cycle to size 2.5 was observed in the Bugaboos on a variety of aspects in the alpine.

Snowpack Summary

Forecast storm snow is expected to create new slabs. Recent storm snow was shifted into reactive slabs by strong SW-NE winds on Monday. In some areas, the new snow was sluffing fast and far. Deep storm slabs which formed last week are slowly gaining strength. Cornices are large. A weak layer of surface hoar and/or a crust sits about 50-120 cm below the surface. It’s of most concern at alpine and treeline elevations and exhibits variable results in snowpack tests. At low elevations, a supportive crust above this layer means it's difficult to trigger. This layer may linger with ‘low probability/ high consequence’ type character. Testing for this interface in your local area should help you gain (or lose) confidence before committing to aggressive terrain. A facet/crust layer sits at the base of the snowpack in some places.

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