Lawinenlagebericht

South Columbia

Jan 15 – 16, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–5
    Wind slabs may be found behind terrain breaks such as ridges and ribs. It may be possible for a wind slab to step down to a deeper instability.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–5
    Persistent weaknesses are variable in their distribution but can still be triggered by the weight of a person or snowmobile. Triggering persistent slabs will become more likely if the snowpack experiences rapid warming.

Avalanche Summary

Avalanche activity has begun to slow, but occasional skier-triggered avalanches are still being reported, failing on persistent weak layers from early January. Many of these events were on SE through SW aspects, with the odd persistent slab on other aspects. Some solar-related and loose dry natural activity was observed on Monday.

Confidence

Fair - Due to variable weather conditions

Weather Forecast

Wednesday-Friday: Moderate to strong north-westerly winds. Freezing level is at valley bottom, with alpine inversions possible (parcels of warm air which could bring alpine temperatures close to 0). Light snow is possible on Wednesday.

Snowpack Summary

North to north-westerly winds have left wind slabs in the lee of terrain breaks such as ridges and ribs at alpine and treeline elevations. Recent storm snow is settling over old snow surfaces including surface hoar (found especially at and below treeline in sheltered areas), a sun crust (on steep S to SW -facing slopes) and facets. The distribution of these weaknesses is patchy, but where they exist, it is still possible to trigger a large avalanche with the weight of a person or snowmobile. Watch out for rapid warming on alpine slopes over the next couple of days, which could weaken the slab above these interfaces. A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is now considered inactive.

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