Bulletin d’avalanche

Kootenay Boundary

Jan 27 – 28, 2014Avalanche Canada
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Archivé · expiré 13 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

As danger approaches LOW across the board, it's a good time to remind ourselves that low danger doesn't mean no danger.Food for thought on this blog post.

Problèmes avalancheux

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–5
    With the temperature forecast to cool deep persistent slab avalanches will become less likely.  However, triggering these deep weaknesses is still possible especially in steep, rocky start zones.

Avalanche Summary

With recent warm alpine temperatures natural avalanches to size 2.5 were reported on steep solar aspects. In a couple of cases, avalanche activity occurred as a wet slab and ran to ground.

Confidence

Good

Weather Forecast

Synopsis: Temperatures are forecast to fall through out the week.  A week frontal system is expected to arrive on Wednesday.Tuesday: Clear skies / Light west winds / Freezing level at 1000mWednesday: Light snowfall / Light west winds / Freezing level at 1000mThursday: Scattered flurries / Light north-west winds / Freezing level at 600m

Snowpack Summary

A dusting of snow overlies a variety of surfaces which include old, stubborn wind slabs in exposed upper elevation terrain and well developed surface hoar in sheltered terrain. Surface hoar continues to grow at treeline and below while sun-exposed slopes are now sporting a melt-freeze crust.Ongoing moderate daytime temperatures have promoted settlement within the snowpack, while cool nights have allowed for significant surface faceting.Closer to the ground, below a generally strong mid pack, there are 2 layers of note: the late November surface hoar, and a crust/facet combo from October. These layers have become unlikely to trigger (although still possible with the right input such as a cornice fall, a heavy load over a thin spot in steep terrain, or a rapid temperature change). That said, avalanches at these interfaces would be large and destructive.

Régions couvertes