Bulletin d’avalanche

Cariboos

Dec 12 – 13, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Old windslabs still lurk in lee locations at ridgecrest in the alpine. Be aware of the new snow hiding these old slabs or forming into new soft slabs with the moderate westerly winds.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    Probability of triggering has decreased. Where it still exists, this layer may be capable of producing highly destructive, full depth avalanches.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    The new snow sluffs easily. Minimal hazard at this time, but something to keep in the back of your mind as the load increases.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Tuesday: Isolated flurries, with clouds lifting late in the day. Winds will be westerly up to 40km/h and temperatures should reach -8. Wednesday & Thursday: A weak ridge rebuilds over the region giving mostly clear conditions with light westerly winds and temperatures reaching -5 in the afternoons.

Avalanche Summary

Some sluffing of the new snow (up to size 1.0) has been reported, predominantly at treeline and below.

Snowpack Summary

10-20cm of new snow has fallen in the past couple of days. This overlies surface hoar (as large as 10mm in protected areas), surface facets, the odd old windslab and sun crusts (on steep south through west aspects). The new snow has fallen with limited winds effect. All of these newly buried surfaces are good sliding interfaces; all that's lacking is a large enough load. As more snow arrives and/or the wind picks up (as per the forecast) the avalanche danger will increase. Due to the slow, incremental increase in load (dribs and drabs of new snow and sporadic winds), this increase in danger is difficult to pinpoint and could be very site specific.In some locations there is a rain crust buried between 20-35cm. This crust extends as high as 2200m. Some faceting has been observed around the crust; definitely worth remembering this one.The early November surface hoar remains a layer of concern. Buried 100-150cm it is unlikely to trigger, but consequences of triggering would be a large (up to size 3.0) destructive avalanche.

Régions couvertes