Bulletin d’avalanche

Cariboos

Nov 23 – 24, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sun
Mon
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

This bulletin is based on limited data. Local variations in conditions are likely to exist. Check out the forecasters blog for further details on interpreting early season bulletins.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    There are reports that the early November crust is also in this region. There may not have been much snow on the ground except in the high alpine when this crust formed. The new storm load may cause this layer to become reactive.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    The new storm snow and wind are expected to develop new slabs that may not bond well to old wind affected surfaces.

Confidence

Poor - Due to limited field observations for the entire period

Weather Forecast

Overnight and Saturday: Cooling trend behind the storm as High pressure moves into the region, freezing level at valley bottoms. Expect -10.0 in the alpine. Winds should clock to the NW. No precipitation expected.Sunday: Should still be under the influence of the High pressure. Cooler temps and light winds.Monday: Continued High pressure.

Avalanche Summary

We have a report from the Valemount area of  a snowmobile triggering a size 2.0 avalanche that was about 70 cm deep and about 80 metres wide. See photo here. The avalanche was triggered from a shallow weak area, and suspect that the weak layer was either the November crust or buried surface hoar. Please send us an email if you have any observations.

Snowpack Summary

Reports show that the region has had between 20-40 cm from the recent storm. Near Valemount the HS was 145 cm at 1975 metres during the storm. The foot penetration was 60 cm, so there is quite a bit of snow available now for transport by the strong winds during the day Friday and forecast for Friday night. The November rain crust was found down 100 cm and has been described as a weight bearing crust. There may also be a thin buried surface hoar layer down about 70 cm in the alpine. Buried persistent weak layers may become reactive with the recent storm loading.

Régions couvertes