Bulletin d’avalanche

Banff Yoho Kootenay

Apr 13 – 14, 2018Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

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

The alpine hazard will slowly increase as new snow arrives. Watch for wind loading, and the bond with buried sun crusts. Lower elevation hazard will fluctuate with the temperatures, rising during the day and lowering overnight.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    With some new snow and stronger SW winds the wind slabs have become a bit more reactive over the past 24 hrs, especially where present over a buried sun crust.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–2.5
    Forecasters are still concerned about the Mar 15 sun crust which is down 25-50 cm on steeper solar aspects. There have been sporadic skier and explosive triggered avalanches on this layer over the past several weeks, but nothing in the last few days.

Weather Forecast

Saturdays forecast is for 5-10 cm of snow along the divide with snow fall amounts easing off by mid day, and moderate SW winds in the alpine. Freezing levels are forecast to stay below 2000m. An additional 5-10 cm is forecast for Sunday night along the divide, though not much is expected in the Eastern parts near the town of Banff.

Snowpack Summary

5-8 cm of new snow on Friday with wind effect in the alpine from Mod SW winds and thin wind slabs in lee areas. The March 15 sun crust is down 25-50 cm on solar aspects in the alpine and still a concern in some locations. Various temperature crusts and/or moist snow can be found on solar aspects in the alpine and on all aspects below 2000m.

Avalanche Summary

Some thin touchy skier controlled wind slabs were reported on Friday from the local ski hills up to size 1, with propagations of up to 50 m wide on solar aspects. No new natural avalanches were observed on a flight to the Wapta Icefields Friday morning.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Régions couvertes