Lawinenlagebericht

Jasper

Feb 14 – 15, 2017Parks Canada
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Archiviert · abgelaufen 10 years ago

Lawinengefahr

Tue
Wed
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Kernpunkte

Warm alpine temperatures and flip-flops in the valley bottom. Rapid settlement of an already stressed snowpack likely to prolong this very active avalanche cycle. 

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–3
    Hard touchy windslab in the alpine and open tree-line features showing very serious potential for wide propagation in connected features.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1–3
    Avalanches initiated within the storm snow may step down to deeper layers and in some cases gouging to ground in thin snowpack areas.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    30-40cm of storm snow has formed a touchy storm slab.

Weather Forecast

SW-ly winds expected to again increase to moderate values for Tuesday with the arrival of the warm moist air. Alpine temps forecast to be near freezing with a mix of sun and cloud. Precip expected in the middle of the week with freezing levels to 2100m.

Snowpack Summary

Hard surface windslab in the alpine and open tree-line features. Recent HST in sheltered locations at tree-line and below forming a cohesive soft slab over a faceted mid-pack with only marginal support below tree-line. This is all sitting on a weak base of large facets and depth hoar to create an overall delicate and untrustworthy snowpack.

Avalanche Summary

Avalanche control on the Icefields Parkway and Maligne Lake road. Loaded lee features showing impressive propagation character up to size 3 in alpine targets. Previously controlled slopes two days prior were reloaded and ran again to size 2.5; burying the road more than a meter deep. 

Confidence

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