Lawinenlagebericht

North Columbia

Mar 9 – 10, 2024Avalanche Canada
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Archiviert · abgelaufen 3 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Kernpunkte

Human triggered persistent slab avalanches continue to be reported in the region. Stick to low consequence terrain. Check out our Forecaster's Blog on recent avalanche activity.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2

    Recent winds have formed wind slabs on a variety of aspects. If triggered, wind slabs could step down to deeper layers.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–4

    A weak layer of faceted grains above a crust buried 70 to 140 cm deep is a recipe for large, high-consequence avalanches. Remote triggering is an ongoing concern and means the layer is still primed for human triggering.

Confidence

Moderate

Avalanche Summary

The number of reports continues to decrease, however, large rider, natural and explosives-triggered persistent slab avalanches continue to be reported throughout the region. Some avalanches have run full path to the valley bottom. Many human-triggered avalanches have been remotely triggered (from a distance).

Last Sunday a fatal avalanche incident occurred north of Revelstoke. It was size 2 persistent slab avalanche on a northeast aspect at 2000 m. View the report.

Snowpack Summary

A crust could be found on steep south and west-facing terrain at or just below the surface. Exposed terrain at higher elevations has been affected by recent wind blowing from a variety of directions.

50 to 120 cm overlies a variety of potential weak layers, including surface hoar in wind-sheltered terrain, weak facets, or a hard melt-freeze crust on south and west-facing slopes.

A thick and hard widespread crust that formed in early February is buried about 80 to 160 cm deep and extends up to 2400 m. This crust may have a layer of weak facets above it.

Weather Summary

Friday Night

Mostly cloudy with 0 to 2 cm of snow. 40 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1400 m.

Saturday

Mix of sun and cloud with 0 to 5 cm of snow. 40 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1600 m.

Sunday

Cloudy with 5 to 15 cm of snow. 40 to 50 km/h southwest ridetop wind. Treeline temperature -5 °C. Freezing level 1600 m.

Monday

Cloudy with 5 to 15 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Conservative terrain selection is critical, choose only well supported, low consequence lines.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

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