Boletín de aludes

South Rockies

Apr 2 – 3, 2013Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Thu
Fri
Alta montaña
1 · Débil
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Be alert to conditions that change with daytime warming. Danger ratings are likely to exceed posted levels if solar radiation is strong, especially at treeline and below.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–5
    Large looming cornices exist on most ridgelines. They are a hazard in themselves and they could trigger slopes below.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–4
    Intense solar radiation is unlikely on Wednesday. If the sun is strong, however, loose wet avalanches can be expected on sun-exposed slopes.

  • Wet Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–6
    Large wet slab, and glide crack releases may occur in the heat of the day if the sun is shining.

Confidence

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

Weather Forecast

Wednesday: Overcast skies with very light snowfall / Light southwest winds / Freezing level at 2200mThursday: Moderate snowfall/rain developing late in the day / Moderate southwest winds / Freezing level at 2400mFriday: Moderate to locally heavy snowfall/rain / moderate southwest winds / Freezing level at 1800m

Avalanche Summary

On Monday, numerous wet slab avalanches and glide crack releases were reported up to size 3 from South-West aspects. As long as temperatures are warm and solar radiation is high, I would expect more of this activity.

Snowpack Summary

We are in a classic spring melt-freeze cycle. The surface snow becomes moist up to 2200m on all aspect and to ridgecrest on sun-exposed slopes. Large cornices are becoming weak due to strong solar radiation and warming temperatures. Surface hoar growth and surface facetting is happening at night on high sheltered, northerly aspects. Isolated wind slabs exist in the immediate lee of ridge crests and terrain featuresA buried rain crust can be found down 50 cm and exists up to around 2100 m. Although unlikely, a large trigger such as a cornice fall or warming on a solar aspect could cause this layer to fail.

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