Bollettino valanghe

Northwest Coastal

Mar 27 – 28, 2014Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

Sat
Sun
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–4
    Strong Easterly outflow winds have developed hard wind slabs in the alpine and at treeline.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–5
    The early March persistent weak layer is buried deep enough to produce large avalanches when triggered. Periods of solar radiation may increase the sensitivity to triggering this buried weak layer.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    3–6
    The early February persistent weak layer is buried deeply in the snowpack and continues to be a concern. Heavy loads like cornice falls or storm slab avalanches in motion may trigger this weak layer resulting in very large avalanches.

Confidence

Fair - Wind effect is extremely variable

Weather Forecast

Overnight and Friday: Overcast and cool overnight with freezing levels dropping down to valley bottoms. Continued strong Easterly outflow winds during the day with freezing levels rising to 500 metres.Saturday: Cool and overcast with a chance of flurries and freezing levels rising to 700 metres. Outflow winds are expected to continue from the East.Sunday: Chance of broken skies and periods of sun with a weak Northwest flow. Freezing levels rising to about 600 metres.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

Strong Easterly winds have been reported to have caused intense wind transport of the recent storm snow, developing pockets of wind slab on various aspects in the alpine and at treeline. Forecast cool temperatures are not expected to promote much settling or bonding of the near surface layers, and probably not much change to the persistent weak layers. The deeply buried persistent weak layers continue to provide moderate to hard sudden planar results in snow profile tests, but may be deep enough to require a heavy load for triggering. The March weak layer is a combination of hard wind-scoured slab surfaces in exposed terrain, facets and/or surface hoar in sheltered and north aspects, and sun crust on steep solar aspects. This layer is widespread throughout the forecast region and is now buried close to 150cm in most parts of the area. A late January/early February crust/facet/surface hoar combo is now buried 200 cm or more.

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