Lawinenlagebericht

Banff Yoho Kootenay

Nov 28 – 29, 2022Avalanche Canada
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Archiviert · abgelaufen 4 years ago

Lawinengefahr

Wed
Thu
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Uncertainty remains with how the new snow will contribute to the likelihood of triggering persistent slabs, that were already overlying a weak base.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–1.5

    Up to 20cm of new snow distributed by strong winds has created thin soft slabs. Many of these sit on older wind pressed surfaces.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1.5–2.5

    Slabs overly weak facets (and even some depth hoar) in most areas, as well as suncrusts and surface hoar in isolated locations.

  • Loose Dry

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–1.5

    New snow and wind input on Sunday will promote loose dry avalanches. This is mainly a problem for ice climbers and skiers in steep, gullied terrain.

Confidence

Moderate

Avalanche Summary

Lake Louise ski area triggered a size 1.5 wind slab with explosives in a high alpine lee pocket. Otherwise no avalanches were observed or reported.

Snowpack Summary

Up to 20cm of new snow has accumulated in the last 3 days, less so in valley bottoms. Windy conditions has promoted wind slab development in the alpine. The snowpack below these slabs is a mix of facets, spotty surface hoar, and sun crust on steep south aspects. 40-80 cm of total snow exists at treeline throughout the region, with up to 120 cm in loaded alpine features.

Weather Summary

Dropping temperatures and clearing skies into Monday. -20 at the ridge and -15 in valley are expected. The wind will also decrease into the light range from the North.

https://avalanche.ca/weather/forecast

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.

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