Bollettino valanghe

Northwest Inland

Feb 23 – 24, 2013Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
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
    Likely
    Dimensione
    1–4
    New snow has been redistributed into dense wind slabs in exposed lee terrain and cross-loaded gully features. Triggering is likely on steep wind loaded slopes.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Buried beneath the new snow sits a surface hoar/crust/facet weakness down 50 - 100 cm. This may be sensitive to rider triggering in steeper sheltered terrain or over convex rolls, especially at treeline elevations.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Synopsis: The active weather pattern continues into next week with a series of frontal systems affecting the region with short breaks in between each pulse.Overnight and Sunday: The first system arrives late Saturday bringing 5-10 cm overnight, and an additional 5-10 cm on Monday morning. The freezing level is around 800 m and winds are moderate to strong from the southwest. Monday: Cloudy with sunny breaks. The freezing level is near valley bottom and winds ease to light from the northeast. Tuesday: The next system arrives bringing more cloud and light snow with increasing winds.

Avalanche Summary

There are no new reports of avalanches; however, observations have been limited due to poor visibility and weather.

Snowpack Summary

Around 30 cm of new snow has fallen in the past couple days. This new snow was accompanied by strong southwest winds forming wind slabs in exposed terrain in lee of ridges, in gullies, and behind terrain features. There are a variety of old interfaces now down 40 - 100cm which include facets, crusts and isolated pockets of surface hoar. There is very limited information about the nature of this interface. I would stress the importance of digging down to find and test weak layers before committing to larger and steeper slopes.A strong mid-pack currently overlies a weak base layer of facets/depth hoar. It is worth noting that the snowpack in general is quite shallow compared to averages; triggering the basal weakness may still be possible from thin spots, rocky outcrops or under the weight of larger triggers such as cornice fall.

Regioni coperte