Bollettino valanghe

South Rockies

Dec 8 – 9, 2017Avalanche Canada
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Archiviato · scaduto 9 years ago

Pericolo valanghe

Sun
Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Weaknesses deep in the snowpack will heal much more slowly than wind slabs. Keep your guard up around big overhead terrain and in thin snowpack areas in the alpine.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    A recent wind shift from southwest to north means that wind slabs now exist on a wide range of aspects at higher elevations. Be especially cautious of reverse loaded or cross-loaded slopes that see sun exposure.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2
    Warm, sun-exposed slopes could continue to produce wet loose avalanches either naturally or with rider triggers on Saturday, especially in steeper terrain. This problem may expand to northerly aspects as warming persists.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    2–3
    Several persistent weak layers exist at the base of the snowpack. The risk of triggering one of these weaknesses will be elevated while warm weather persists at higher elevations.

Confidence

Moderate -

Weather Forecast

Saturday: Mainly sunny with valley cloud due to lingering temperature inversion. Light west winds. Freezing level to 3500 metres with alpine temperatures around +4. Cooler at lover elevationsSunday: Mainly cloudy. Light west winds. Freezing level to 3500 metres with alpine temperatures around +6. Cooler at lower elevations.Monday: Mainly sunny with some valley cloud due to lingering inversion. Light southwest winds. Freezing level to 3500 metres with alpine temperatures around +7. Cooler at lower elevations.

Avalanche Summary

No new avalanches have been reported from this region. Although warm daytime temperatures and overnight cooling are likely helping bond recent wind slabs to the surface, the potential for releases deeper in the snowpack will remain elevated as these warm temperatures persist. Thin and variable snowpack depth areas will be the most likely trigger points for a deep release.Please submit your observations to the Mountain Information Network.

Snowpack Summary

Average snowpack depths at upper elevations in the region range from about 50-100 cm. Solar and temperature crusts are expected to have formed on the surface at higher elevations over the past two days. Below the surface, recent shifting winds extended wind slab formation to a wide range of aspects at treeline and above. The two crusts that were buried near the end of November can now be found approximately 30 cm and 60 cm down. A third crust from the end of October exists as a "facet/crust" combo near the base of the snowpack. Snowpack testing in the adjacent Kananaskis Country forecast region has yielded hard but sudden results on this layer.

Regioni coperte