Bollettino valanghe

Banff Yoho Kootenay

Jan 25 – 26, 2015Parks Canada
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Archiviato · scaduto 12 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Triggering an avalanche is likely, and large natural avalanches are possible over the next couple of days due to warm temperatures, strong West winds and recent new snow. SH

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2
    New wind slabs will be continuing to form in open areas above tree line with the strong W winds, new snow and warm temperatures. These will be prone to human triggering over the next few days.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–2
    Strong winds may keep snow surfaces cool at upper elevations, but thin rocky areas on solar aspects should be suspect to warming, and may trigger the weaker basal layers and subsequent larger avalanches.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–3
    In shallower snowpack areas (most of the region) the weak base of the snowpack persists and could be triggered in steep, rocky terrain features. Although in some areas, the Dec. 18th layer persists, management of both layers should be the same.

Weather Forecast

A mix of sun and cloud Sunday, with westerly alpine winds reaching 125-150+km/h, and strongest around the Banff region. Temperatures will remain above zero at valley bottom and alpine temperatures will stay just below freezing. We don't expect any significant snow over the next 3 days.

Snowpack Summary

Snowpack tests continue to produce moderate to hard sudden results on the Dec. 18th interface/basal weakness which has become one and the same in most areas with less than 1m of snow. New snow (5-10cm in Banff area, 15cm at Sunshine, 15-20cm in Lake Louise), warming temperatures and strong W winds are creating wind slabs in lee areas.

Avalanche Summary

Numerous natural avalanches were reported today. Notably, the bowl above the Urs hole ice climb on Cascade Mountain had numerous natural avalanches, with one size 3 stepping down to the basal weakness. This was likely triggered by sun. Wind loading in other alpine areas which received more snow saw isolated avalanches to size 2 on lee aspects.

Confidence

Timing or intensity of solar radiation is uncertain on Sunday

Regioni coperte