Bollettino valanghe

Kootenay Boundary

Apr 6 – 7, 2014Avalanche Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Tue
Wed
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Apri la mappa completa

In sintesi

Forecast warm temperatures, high freezing levels, and sunny skies are expected to increase the avalanche danger.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    Incremental loading has developed a storm slab that is between 15-40 cm thick. This storm slab continues to be triggered by heavy loads like explosives and cornice falls. Rising freezing levels may increase sensitivity to triggering.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Forecast rising freezing levels and strong solar radiation may result in loose wet avalanches releasing from steep terrain on solar aspects.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    3–6
    The deeply buried weak layer of crusts and facets continues to be a concern for hard to predict very large avalanches. Warm temperatures, strong solar, or heavy loading from new snow or cornice falls are likely triggers.

Confidence

Good

Weather Forecast

Overnight and Monday: Freezing levels rising overnight to about 2200 metres. Light Westerly winds with mostly clear skies and no precipitation.Tuesday: Freezing levels continue to rise up to about 2600 metres. Southwest winds building to strong in the afternoon combined with moderate to heavy precipitation. Mostly sunny in the morning becoming cloudy in the afternoon.Wednesday: Freezing levels dropping down to 1500 metres as the cold front passes through the region. Sunny with cooler temperatures and light Northwest winds.

Avalanche Summary

Explosives control resulted in several avalanches up to size 2.0 in the Nelson area. Some loose wet slides up to size 1.5 were reported from solar aspects.

Snowpack Summary

The new snow increased the recent storm slab to 15-40 cm in depth. The new thin storm slab is sitting on a 2-5 cm melt-freeze crust that developed last week on all but shaded North aspects in the alpine. This crust has been reported to be "knife" resistance in some parts of the region and may have a layer of surface hoar below the new storm snow. There is now about 75 cm of well compacted snow above the March 10th melt-freeze crust. In some areas the March 10th crust is helping to bridge over the deeply buried late January/early February persistent weak layer. The Jan/Feb deep persistent weak layer continues to be a concern for very large destructive avalanches. Releases on this layer may be more likely during periods of strong solar radiation and/or prolonged warm temperatures at alpine elevations.

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