Bollettino valanghe

Northwest Coastal

Mar 3 – 4, 2013Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

Tue
Wed
Alta quota
2 · Moderato
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
    1–3
    Wind slabs may be found behind terrain breaks. Large fragile cornices are also a concern at the moment.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    Warm sun is weakening surface snow, particularly on steep sun-exposed slopes. Loose wet avalanches can entrain a surprising amount of mass as they travel.

Confidence

Fair - Timing or intensity of solar radiation is uncertain for the entire period

Weather Forecast

Monday: Sunny. Light winds. Freezing level around 700 m.Tuesday: Sunny. Light winds. Freezing level around 400 m.Wednesday: Sunny. Light winds. Freezing level around 300 m.

Avalanche Summary

Sunshine and warming have triggered loose avalanches over the last couple of days. Isolated pockets of wind slab have been triggered by skiers. A widespread natural cycle occurred in response to snow and wind-loading on Wednesday/Thursday, with several slabs of size 2-3, and a few in the size 3-4 range. The largest event failed as the entire snowpack on basal facets and was triggered by cornice fall.

Snowpack Summary

About 40-70 cm recent storm snow is showing signs of stabilizing. Recent strong, variable winds left wind slabs at treeline and alpine elevations. Direct sun is weakening the snowpack on sunny aspects during the day. A layer of surface hoar, facets and/or a crust is buried in the upper snowpack, but most operators report a good bond at this interface. Some large cornice falls have been reported over the past few days. Most have not triggered slabs on the slopes below, however one triggered a very large avalanche. The mid snowpack layers are generally well settled and strong. Facets at the base of the snowpack have resurfaced as a concern now that spring is on the doorstep and full-depth releases are becoming more likely.

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