Bulletin d’avalanche

Jasper

Apr 9 – 10, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Several parties have been surprised by dramatic whumphs on north facing fans below large terrain features recently. Evaluate the snowpack carefully before committing to any big lines.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5
    Pockets of windslab in immediate lees will be buried by incoming new snow, making them more difficult to manage.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–2.5
    Evidence from recent snowpack tests and whumphing would suggest that a weak layer of facets persists down 20-50cm in some areas, and may be becoming reactive with incremental loading from recent small snowfalls.

Confidence

Forecast snowfall amounts are uncertain

Snowpack Summary

Incoming new snow will be covering a strong surface crust on all aspects below treeline, and in to the alpine on solar aspects. A winter snowpack remains on N aspects treeline and above, with small pockets of windslab in lees, facets under an 20-50cm slab in isolated areas, and a weak base of facets and depth hoar in shallow snowpack areas.

Weather Forecast

Unsettled air pushed inland from a low pressure systems hitting the north coast will give several waves of snow flurries, with up to 15cm of accumulation by the end of the week. Wednesday: Cloudy with sunny periods. Afternoon flurries (up to 5cm). Treeline temps: Low -8 C. High -2 C. Ridge wind light SW. Freezing level: 2100m.

Avalanche Summary

No new activity has been observed or reported.

Régions couvertes