Bulletin d’avalanche

Banff Yoho Kootenay

Mar 28 – 29, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

The main concern right now is daytime heating. Start and finish early to take advantage of the colder temps and reduced avalanche hazard in the mornings. Some lingering concerns for deeper weak layers also exist as we transition to spring conditions.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–2
    Weak buried facets are still present in many thin areas. On higher N aspects these have not necessarily been impacted much by the recent heat. This is not currently a big concern in most areas but something to keep in mind if entering bigger terrain.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–1.5
    Clearing skies and warming temperatures will increase the avalanche activity, especially on solar aspects in the afternoon. The recent snow will quickly loose cohesion with any direct solar inputs causing sluffing and loose wet avalanche activity.

Weather Forecast

A mix of sun and cloud for Friday and Saturday will bring slightly warmer temperatures and increased solar inputs. Day time highs for Friday will reach +7'C at valley bottoms but stay below freezing in the alpine. Forecasted winds are generally light. We currently expect a cooler cloudy day on Sunday.

Snowpack Summary

10-20 cm of recent snow overlies a variety of surfaces depending on aspect and elevation. A supportive melt freeze crust is present below the new snow in most areas excluding high north aspects. Many areas have a cohesive mid-pack over the basal facets, while thin areas often have weak facets to ground. Lower elevations are becoming isothermal.

Avalanche Summary

Loose dry avalanches up to size 1.5 were observed above treeline on Wed/Thurs following the arrival of the new snow on Wednesday. There have been a couple isolated size 1.5 to 2 slab avalanches in the last several days running on buried facets in thin snow pack areas. This activity has slowed down with cooling but the weakness persists.

Confidence

Timing or intensity of solar radiation is uncertain on Sunday

Régions couvertes