Bulletin d’avalanche

Jasper

Apr 3 – 4, 2018Parks Canada
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Archivé · expiré 8 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

Good riding on dry snow for the time being. Persistent instabilities, will persist for the remainder of the season.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2.5
    In most cases this interface presents as a manageable surface instability and is expected to go dormant pretty quickly. Pay close attention to any fellow travelers above and/or below you as enter fresh terrain.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3
    Cornices are growing with fresh snow additions. Several failures were noted, in most cases triggering a slab below.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2.5
    Wind slabs sit on a hard melt-freeze crust on solar aspects, and facets on polar aspects. Assess the bond at these interfaces carefully before committing to to a slope.

Weather Forecast

"La Nina" spring continuing. A slow shift into 'spring-like' weather for the Rockies. Gradually, the NW flow is being replaced with a western zonal flow. This will eventually push the arctic air out, but  temperatures and freezing levels are not expected to rise above valley bottom before Friday. Light winds with a trace of precip for the region.

Snowpack Summary

A variety of slab conditions exist on most aspects at treeline and above. 10-20cm of recent storm snow has created a settled new wind slab. This slab can be up to 30cm thick . Below this, older slabs up to 60cm thick sit on a sun-crust on solar aspects and facets on polar aspects. Below treeline the snow is shallow.

Avalanche Summary

No new avalanches reported or observed.

Confidence

Due to the number of field observations

Régions couvertes