Boletín de aludes

Purcells

Mar 7, 2018Avalanche Canada
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Archivado · caducó 9 years ago

Peligro de aludes

Thu
Fri
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Avalanche danger will spike higher than forecast on slopes that are being cooked by the sun.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Recent variable winds have left behind slabs in the lee of ridges and ribs. Cornices are fragile and may fall with solar warming.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1.5–3
    Persistent slabs are most likely to be triggered with a large load like cornice fall; or by a person in a thin or variable-depth snowpack spot. Solar warming could make a slab easier to trigger too.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

WEDNESDAY: Mix of sun and cloud with flurries. Treeline temperature near -5. Light south-westerly winds.THURSDAY: Cloudy with flurries. 5 cm snow overnight. Treeline temperature near -5. Light south-westerly winds.FRIDAY: Mix of sun and cloud. Treeline temperature near -3. Light south-westerly winds.

Avalanche Summary

A natural cycle of wind slabs and storm slabs to size 2.5 was reported on Sunday/Monday. Explosives testing on Monday produced more storm slabs and wind slabs to size 2.5 on a variety of aspects.

Snowpack Summary

Recent storm snow continues to settle and dry out. Variable recent winds have left behind wind slabs on many slopes at treeline and above. These are expected to heal within a day or two. Direct sun is likely to weaken surface snow layers and give cornices a bit of an extra nudge too.A couple of layers buried in mid-late February (down around 50-100 cm) are variably reactive, but both have the potential to create surprisingly large avalanches if triggered. Initially, this interface was most reactive on solar aspects, where it presents as a buried sun crust. However, it has been triggered on shady aspects too, where surface hoar and/or facets exist.Deeper persistent weak layers from January and December are generally considered dormant, but could wake up with significant warming, a surface avalanche stepping down, a cornice fall, or a human trigger in a shallow or variable-depth snowpack area. These layers consist of sun crust, surface hoar and/or facets. Facets linger at the base of the snowpack.

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