Bollettino valanghe

Northwest Coastal

Mar 13 – 14, 2018Avalanche Canada
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Archiviato · scaduto 9 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Strong winds have produced wind slabs in lee and cross-loaded features. The best riding will be in areas sheltered from the wind and effects from the recent warming.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2.5
    Strong south to easterly winds have produced wind slabs in lee and cross-loaded terrain features. These slabs overly a crust or weak surface hoar layer in parts of the region, allowing for wide propagation and fast-moving avalanches.

Confidence

Moderate -

Weather Forecast

WEDNESDAY: Cloudy with light snowfall early morning, accumulation 2 to 5 cm, moderate southerly winds, alpine temperature -2 C, freezing level 1100 m.THURSDAY: Mostly cloudy with light snowfall, accumulation 1 to 3 cm, light northwesterly winds, alpine temperature -3 C, freezing level 900 m.FRIDAY: Mix of sun and cloud, light northwesterly winds, alpine temperature 0 C, freezing level 1500 m.

Avalanche Summary

Numerous wind slabs were triggered by skiers in immediate lee features. They were small (up to size 1.5) and generally on northerly aspects. Otherwise, widespread loose wet avalanche activity was noted in the region on southerly aspects, up to size 2.

Snowpack Summary

Strong easterly to southerly winds have redistributed recent snow and produced variable surfaces in alpine and treeline terrain, including wind slabs in lee and cross-loaded features. This overlies a sun crust on solar aspects and 5 to 20 mm surface hoar on sheltered, shady aspects at all elevation bands. Expect the snow surface to be a melt-freeze crust on solar aspects and on all aspects below 1400 m, up to 20 cm thick.Beneath this, layers of crusts, facets, and isolated surface hoar buried 50 to 100 cm exist below the surface from mid- and late-February. A surface hoar and crust layer from January is buried around 150 to 200 cm.Near the bottom of the snowpack, sugary facets exist in colder and dryer parts of the region, such as the far north.

Regioni coperte