Bulletin d’avalanche

Northwest Inland

Apr 17 – 18, 2017Avalanche Canada
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Archivé · expiré 9 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

Expect the avalanche danger to increase if the sun comes out and the temperature rises through the day.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Cornices are large and fragile, expect then to fall off naturally during periods of strong solar radiation and during the warmest part of the day.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Loose wet avalanches are more likely during periods of strong solar radiation and daytime warming. Snow at lower elevations may become isothermal and release from steep terrain on all aspects.

Confidence

High -

Weather Forecast

Overnight: Flurries combined with moderate southeast winds and freezing down to valley bottoms. Tuesday: Mix of sun and cloud with convective flurries and moderate southwest winds. Daytime freezing up to 900 metres. Wednesday: 3-5 cm of new snow with moderate southerly winds and daytime freezing up to 1400 metres. Thursday: Mix of sun and cloud with light winds and daytime freezing up to 1700 metres.

Avalanche Summary

A MIN report from the Babines on Saturday details a size 1 windslab skier accidentally triggered avalanche on a southwest aspect at 2050 metres. You can read the full MIN report here. Exposure to large overhanging cornices remains a significant concern. If the sun comes out expect to see cornices weaken and loose snow avalanches run from steep sun exposed slopes during the warmest parts of the day.

Snowpack Summary

New snow falling last week has been redistributed by south and east wind at upper elevations. This is likely sitting on a hard wind crust in exposed alpine areas and sun crust on aspects facing the sun. Lower elevations are experiencing a melt-freeze cycle and the snowpack is likely moist or wet throughout its entire thickness. A deep persistent weak layer is still lingering near the bottom of the snowpack in all areas. A report from the Babines on Saturday detailed 10-15 cm of recent snow above a supportive crust at treeline. You can read the full MIN report here.

Régions couvertes