Lawinenlagebericht

South Rockies

Feb 5 – 6, 2012Avalanche Canada
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Archiviert · abgelaufen 15 years ago

Lawinengefahr

Tue
Wed
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Lawinenprobleme

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    3–6
    Cornices are large, unsupported and may be a trigger for a large avalanche on the slope below. Give cornices a wide berth from above and below.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    Watch for wet snow avalanches on steep south facing slopes from late morning onward.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–6
    Deep and destructive persistent slabs are becoming less likely, but may be triggered with a larger trigger (cornice fall, sled).

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

A ridge of high pressure will remain imbedded over the region for the forecast period. Winds will be mostly light and easterly with alpine temperatures remaining well below freezing.

Avalanche Summary

Over the weekend widespread natural activity to size 3 was reported on sun-exposed aspects in the alpine. Although a decrease in avalanche activity is expected with forecast cooling, triggering of deeper weaknesses may still be a possibility with a large trigger.

Snowpack Summary

Storm snow from the last few weeks seems to be fairly well settled. In the mid snowpack sits the mid-December surface hoar layer. Lately this layer has been less of a concern. At the base of the snowpack basal facets and depth hoar seem fairly widespread in the region. The big story for the weekend was warming at higher elevations due to an inversion and solar heating. Failing cornices, loose wet snow avalanches on sun-exposed slopes and isolated deep releases on basal facets at higher elevations were the big things to watch for. With forecast cooling for Monday expect a crust recovery on most slopes that were affected by the sun as well as decreased probability of avalanche activity. In Elk Valley North and the Crowsnest, the average snowpack depth at treeline is 150 cms. In Elk Valley S and the Flathead the snowpack depth is closer to 2 m. If you are traveling in the mountains it's a good time to take stock of layers that are developing on the current surface (crusts/surface hoar) that may become an issue when it finally snows.

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