Bulletin d’avalanche

Banff Yoho Kootenay

Nov 13 – 14, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Fri
Sat
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

With large amounts of snow currently showing in forecasts, we expect  avalanche activity to begin Friday and continue through the weekend. TH

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    The new snow will fail naturally off of very steep features and will be susceptible to human triggering in steep areas. Avoid confined features where these events can become focused, and manage your group carefully to avoid getting caught.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    The new snow will be warm, heavy and wind driven: perfect for slab development. New slabs will likely bond poorly to the weak dry snowpack that currently exists in most areas and the crusts and surface hoar we are hearing about will not help either.

Weather Forecast

A powerful low will exert its influence over the region beginning Thursday evening. Accumulations of 50-100 cm of snow at treeline, high winds, and freezing levels rising to near 2000 m have been forecast to appear by the time the system passes on Sunday. With the heavy loading expected, an avalanche cycle will likely begin on Friday.

Snowpack Summary

35-45 cm of unconsolidated snow exist at treeline elevations throughout the forecast area. A 5mm layer of surface hoar that was reported in some areas has been buried by several cm of new snow yesterday (November 11 surface hoar). Some soft wind slabs exist at higher alpine elevations.

Avalanche Summary

Over the past five days slabs and loose snow avalanches (up to size 2.5) have been triggered and are running naturally from alpine features. Tuesday, at Bow Summit, a size 1.5 avalanche was remotely triggered on the ground, and on the Wapta a group remotely triggered a size 2 on Mt. Olive.

Confidence

Intensity of incoming weather systems is uncertain on Thursday

Régions couvertes