Lawinenlagebericht

Waterton Lakes

Mar 15 – 17, 2014Parks Canada
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Archiviert · abgelaufen 13 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Conditions continue to be tricky because of warm temperatures, rain/snowfall. There continues to be concern for the persistent week layer and it's potential to propagate. Crusts exist on all aspects up to ridgetop making for challenging travel.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–2
    New snow Fri is starting to build windslabs on lee slopes. The storm snow forecast for Sun/Mon will build these deeper. These will need some time to settle.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely
    Größe
    1–3
    The layer down 70-170 cm is still active as demonstrated Thur with avalanche control work up Akamina. Any slope not yet slid should be a concern. Windslabs, cornices, storm slabs or wet loose avalanches could step down and result in large avalanches.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–2
    With freezing levels climbing during the daytime, precipitation at lower elevations will be wet snow or rain. Loose wet avalanches will be likely depending on the amount of snow and if rainfull is heavy wet slab avalanche will also be a concern.

Weather Forecast

Saturday will be cooler with isolated flurries but sunny periods because another storm system arrives on Sunday morning. This storm could bring another 40cm of snow with strong SW winds adding to already building windslabs on lees slope. Freezing levels will climb up to around 1700m again meaning rain or wet snow is likely below this elevation.

Snowpack Summary

Suncrusts have formed on solar aspects. These are buried by 10cm of snow that fell today above 1700m, below that was wet snow/rain. Moist snow is still present under the crusts to 1900m from rain on 0310. Feb facet layer down 70-170cm and large avalanches have resulted when this layer is triggered because of the propagation potential of this layer.

Avalanche Summary

Although natural activity has tapered off, helicopter bombing of the path that hit the Akamina parkway on the weekend produced numerous sz 1.5 as well as a 2.5 that almost hit the road again. The active layer is still the Feb facet layer. Small loose dry avalanches occurred today at higher elevations while loose wet avlanaches occurred below 1700m.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

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