Bollettino valanghe

Purcells

Apr 2 – 3, 2013Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Natural cornice falls are a concern during daytime warming. Cornices may also be triggered easily by traveling near them.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–6
    Small solar triggered slides, cornice fall, or thin-spot triggering may overload a persistent weakness buried 100 cm deep. This could lead to surprisingly large avalanches.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–4
    Expect to see wet loose snow avalanches out of steep rocky sun-exposed slopes. Natural avalanche activity. snowballing, moist and wet snow surfaces are all initial indications of the upper snowpack deteriorating.

Confidence

Fair - Timing or intensity of solar radiation is uncertain for the entire period

Weather Forecast

Wednesday: Overcast skies / Light northwest winds / Freezing level at 1700mThursday: A high pressure system builds promoting clear and dry conditions with light westerly winds and 1800m freezing levels.Friday: An upper trough of low pressure will move over the Interior on Friday bringing light to locally moderate precipitation. Freezing levels will be in the valley bottom in the morning and rise to 1700m in the afternoon.

Avalanche Summary

Numerous natural loose wet and wet slab avalanches up to size 2.5 have recently been reported from solar aspects at a treeline and above.

Snowpack Summary

Surface faceting and surface hoar growth (up to 20 mm) has been prevalent on high, shady aspects, while the surface snow on sun-exposed slopes and at lower elevations (below 2000m) has been subject to daily melt-freeze cycles.Cornices are large and weak. Pockets of wind slab can be found on lee slopes and are possible to trigger under your skis or sled.A layer of buried surface hoar sitting on a crust down around 70-120cm, and has been producing variable results in snowpack tests. This persistent weakness remains a concern because of the potential for very large avalanches particularly with heavy triggers such as cornice falls. Old deep persistent weaknesses, including basal depth hoar, are a concern in shallow snowpack areas.

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