Lawinenlagebericht

South Columbia

Jan 16 – 17, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

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

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–4
    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.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Thursday: Light W winds. Alpine temperature near -2. Freezing level is at valley bottom, with alpine inversions possible (parcels of warm air which could bring relatively warm alpine temperatures). No snow.Friday: Light NW winds. Alpine temperature near -9. No snow.Saturday: Light to moderate SW winds. Alpine temperature near -1. No snow.

Avalanche Summary

A natural and human-triggered cycle of wind slabs to size 2 was observed on Tuesday. Solar-triggered loose snow avalanches also failed on steep sun-exposed slopes. Occasional skier-triggered avalanches have been failing on persistent weak layers from early January over the last week. These have mostly been on steep south-facing slopes or sheltered slopes below treeline.

Snowpack Summary

Strong north to north-westerly winds have left wind slabs in many areas, even at treeline. Settled storm snow sits above 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 may still be possible to trigger a large avalanche with the weight of a person or snowmobile. 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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