Bulletin d’avalanche

Banff Yoho Kootenay

Mar 9 – 10, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

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

More new snow has arrived than expected in most areas with touchy new slabs observed in the alpine. Expect conditions to have changed significantly from the last few weeks.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Touchy new slabs can be found in wind loaded areas up to 40cm thick. These slabs will be found sitting on the weak, faceted snow that was previously on the surface and we expect the bond to this snow to be poor.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    Cold weather created weak, faceted surface snow. In steep terrain, these facets are easily triggered and can gain enough mass to affect skiers and climbers. The new snow and winds have triggered many events in the last 24 hrs.

Weather Forecast

Much more snow than was expected arrived in the majority of the region Friday with moderate to strong SW - W winds. Saturday, look for winds to back off and snow to stop with partly cloudy skies remaining. Temperatures will be steady at around -10 to -15 at treeline through Saturday before warming about 5 degrees overall Sunday afternoon.

Snowpack Summary

A trace to 20 cm of new snow came with moderate to strong SW-W winds. This sits over weak surface facets, previous wind effect and crusts isolated to steep solar slopes. Weaker layers like the Jan.17 surface hoar/facets linger down 40-60 cm in some locations, but are currently lying dormant. A weak basal snowpack exists in thin snowpack areas.

Avalanche Summary

A flight in the Lake Louise area this morning saw several examples of loose dry avalanches running a good distance that had failed with the new loading. While only a few examples of fresh slabs were seen on the flight with poor visibility, the ski hills reported working with a touchy new slab up to 40 cm deep, up to 40m wide and running up to 150m.

Confidence

Due to the number of field observations on Friday

Régions couvertes