Boletín de aludes

Northwest Coastal

Feb 26 – 27, 2014Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Fri
Sat
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Check out the new Forecaster Blog for an update on the “Touchy Weak Layer.”

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    Northerly or Easterly outflow winds may reverse load slopes that have been previously stripped of storm snow. These new wind slabs may be triggered by forecast solar radiation.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–5
    The early February persistent weak layer continues to be sensitive to any additional load. Forecast solar radiation may trigger another round of natural activity on the buried weak layer.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Forecast solar radiation may release moist or wet snow from steep Southerly aspects. Wet snow in motion may step down to deeply buried weak layers.

Confidence

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

Weather Forecast

Overnight and Thursday: Warm air continues to be trapped in the alpine overnight and during the day Thursday. Freezing levels dropping Thursday afternoon with light Northerly winds and high cloud. No precipitation.Friday: Freezing levels at valley bottoms and alpine temperatures trending colder under sunny skies. Gusty strong outflow winds at lower elevations and light Northerly winds in the alpine.Saturday: Cold clear and sunny. Strong Northeast winds with very strong outflow winds in the major valleys.

Avalanche Summary

Natural avalanches up to size 3.0 were reported from several areas of the region due to reverse loading from the outflow winds above the early February persistent weak layer. Forecast strong solar radiation and high freezing levels may cause moist or wet avalanches on Southerly aspects.

Snowpack Summary

Warm alpine temperatures and strong solar radiation have resulted in snowballing and moist or wet loose snow on steep Southerly aspects. Strong N-SE outflow winds have resulted in reverse loading and cross loading in exposed terrain at all elevations, and have scoured exposed windward slopes. The prominent mid February persistent weakness (surface hoar, facets, crust and/or wind pressed surfaces) is down 60-100 cm in the north and 120-160 cm in the south. Snowpack tests are now giving moderate to hard "pops or drops" shears on this weakness, and several whumpfs are still being reported. Basal facets and/or depth hoar remain a concern in shallow snowpack areas in the northern part of the region. Cornices are also large and may become weak if northerly winds start to undercut them.

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