Bulletin d’avalanche

Jasper

Feb 6 – 7, 2022
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Archivé · expiré 5 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Warming trend and increased solar input could wake up weak layers within the snowpack on Sunday.While the winds continue to scour the alpine, look out for loose wet avalanches below tree line on solar aspects in the afternoon.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5

    Recent snow is available for transport. Wind slabs are likely in lee slopes.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    Persistent slabs sit over different weak layers depending on elevation & aspect. Above 1950m a buried facet layer down 20-40cm is the primary concern. Below 1950m, a faceting crust down 40-70 is presenting a more stubborn version of a similar problem

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    Loose wet will be of most concern in the afternoon (between 13:00- 16:00) as the solar input and temperatures increase.

Weather Forecast

Sunday:

A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: High -7 °C.

Ridge wind southwest: 20 km/h gusting to 45 km/h.

Freezing level at valley bottom.

Monday:

Flurries.

Accumulation: 7 cm.

Alpine temperature: Low -11 °C, High -7 °C.

Ridge wind southwest: 25 km/h gusting to 75 km/h.

Freezing level at valley bottom.

Snowpack Summary

Heavy wind effect at tree line and above. Snowpack is facetted and complex. December facet layers down 20-40cm still reactive in tests; buried surface hoar found in isolated locations.

Avalanche Summary

Road patrol on Maligne road observed few small dry loose avalanches in steep alpine terrain, and one large wind slab in steep alpine NE aspect. Icefields road patrol observed no new natural avalanche activity.

Confidence

Freezing levels are uncertain

Régions couvertes