Bulletin d’avalanche

Jasper

Dec 14 – 15, 2016Parks Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Intense ridge top transport observed today in the alpine. This Northwesterly wind will likely have produced some new windslabs, particularly on South aspects.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Report of a remotely triggered size 1.5 windslab and extensive scouring in the alpine. Intense ridgetop transport observed on field trip today in the Columbia Icefield area likely producing some new windslabs in the alpine.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    The Nov crust is down 40-90cm and is beginning to facet out, lose strength and cohesion. There has been recent activity on this layer and requires respect.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Cold temps promoting facetting of upper snow pack. Expect loose dry avalanches from steep terrain.

Weather Forecast

Temperatures to warm slightly before dropping again to -30 by Friday. No precipitation. Northwest winds to continue, making the alpine feel even colder. The intense ridgetop winds are expected to decrease in the next 48hours. 

Snowpack Summary

Ongoing moderate Northwest winds redistributing cold snow, soft slab formation possible on lee features. Arctic cold temps have penetrated the shallow snowpack and are promoting facetting. Nov12 crust down 45 to 90cm and found between 2100-2600m on all aspects. Intense ridge top transport from the North reverse loading lee features in the alpine.

Avalanche Summary

Numerous loose dry avalanches on Westerly aspects up to Size 2 in Alpine terrain observed along the Icefields Parkway today. Recent shift of winds to the Northwest seem to have been the trigger for these events. One remotely triggered slab avalanche size1.5 was reported from the Boundary Glacier area on Monday, 2400m steep East facing planar slope.

Confidence

Régions couvertes