Bulletin d’avalanche

Northwest Coastal

Mar 26 – 27, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Warm weather and strong sunshine is very likely to set off loose snow avalanches, particularly on southerly aspects.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    When the sun comes out and temperatures rise during the day, loose wet avalanches will be very likely to occur on sun-affected slopes.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2.5
    Wet slab avalanches are possible on steep, smooth slopes that face the sun.

Confidence

High -

Weather Forecast

TUESDAY NIGHT: Flurries with no significant accumulation expected.WEDNESDAY: Dry and sunny. Freezing level around 1600 m. Moderate easterly winds up to 30 km/h.THURSDAY: Dry and sunny. Freezing level around 1600 m. Winds light southeasterly, becoming calm in the afternoon. FRIDAY: Dry and sunny. Freezing level around 1700 m. Winds calm.

Avalanche Summary

A few glide slab avalanches up to size 2.5 have been reported near Terrace since Sunday on southerly slopes. Glide slabs typically happen on steep, smooth terrain features such as rock slabs or grassy slopes with little roughness. They are most common on southerly aspects, but during especially warm weather, may occur on shady aspects as well. Slopes with obvious large cracks (glide cracks) as well as slopes with a known history of glide releases are best avoided.

Snowpack Summary

Dry snow remains on shady slopes in the alpine. In these locations, 50-100 cm of well settled snow overlies a layer of weak facets that were buried around March. 10th. This is currently the primary layer of concern for human triggering persistent slab avalanches, although recent observations suggest it has become difficult to trigger an avalanche on this layer.Not much further below the March 10th interface is a second weak layer of facets buried on February 19th. Recent loose wet and slab avalanches have been observed gouging into this faceted snow and entraining additional mass.The prolonged warm spell has transitioned sun exposed slopes in the alpine and on all aspects at treeline and below towards becoming isothermal (0 C throughout the snowpack). In these areas spring conditions are in effect; the avalanche hazard will fluctuate greatly depending on the strength of the overnight freeze and how quickly the snowpack is warmed up each day. Check out this guide to managing avalanche hazard during spring conditions HERE.

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