Bulletin d’avalanche

Banff Yoho Kootenay

Jan 6 – 7, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

The danger may be elevated in steep terrain and gully features, especially on solar aspects if the sun is out. Loose dry snow is sluffing fast and far and can knock you off or bury you in a terrain trap.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Moderate winds have created hard windslabs in exposed alpine areas. In places, these sit on a layer of facets from the christmas cold snap and were reactive to skiier traffic in the Lake Louise Backountry on Jan. 2nd.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The cold temperatures have facetted the surface snow, and sluffs can pick up mass and travel far. Big sluffs are possible if you are climbing in gullies with steep terrain above, or skiing steep lines. Heads up on solar aspects in particular.

Weather Forecast

Forecasted precipitation beginning Saturday with accumulation values ranging from 10-15cm by Monday. Alpine winds will be moderate to strong from the south west, expect some snow transport in exposed terrain.

Snowpack Summary

20-50cm of snow sits over the december 15 surface hoar layer which is beginning to develop some slab properties. Below this the snowpack is heavily faceted with remanet's of older crust's still lingering throughout. In many areas loose faceted surface snow continues to be the main instability of the snowpack.

Avalanche Summary

A skier triggered avalanche in the Lake Louise backcountry was reported yesterday, releasing a size 1.5 below treeline. This is the 4th skier triggered avalanche in the area this week. The majority of natural avalanche activity continues to be loose dry releases out of steep gully features.

Confidence

Régions couvertes