Lawinenlagebericht

South Rockies

Dec 12 – 13, 2014Avalanche Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Forecast snowfall amounts for Friday night and Saturday are highly uncertain. If more than 15cm of snow falls, consider the Avalanche Danger ratings to be too low.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Wind and new snow on Friday night may form new wind slabs in lee terrain. Windslabs may be extra touchy due to the presence of underlying crusts.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–4
    Recent observations have been extremely limited. However, I'd assume weak crystals near the base of the snowpack are still reactive in some areas. Avalanches at this interface are more likely at higher elevations and could be destructive in nature.

Avalanche Summary

No avalanches have been reported. If you have any observations you'd like to share, please check out the new Mountain Information Network. For details, check out: https://avalanche.ca/blogs/VIYBuScAAJdbdqPz/m-i-n-intro

Confidence

Poor - Due to the number of field observations

Weather Forecast

Forecast snowfall amounts for Friday night and Saturday are in the light to locally moderate range. That said, the collision of the moist southwest flow and the developing cool northwest pattern may deliver enhanced precipitation. Winds on Saturday will be moderate from the southwest switching to northwesterly by mid-day. Freezing levels will descend to valley bottom throughout the day.On Sunday and Monday a dry ridge of high pressure will develop bringing mainly clear skies, light northwest winds and freezing levels at or near valley bottom.

Snowpack Summary

Light rain from the past week has saturated the upper snowpack at higher elevations, and the entire snowpack below treeline. With forecast cooling, these surfaces will likely exist as new crust.There is at least one, maybe more, problematic layers in the mid and lower snowpack. About 90cm of settled snow overlies a weak layer of facets and crusts which formed during November's dry spell. Not much is known about the reactivity of this layer, nor the slab above it, but I'd assume it exists in most alpine terrain.

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