Lawinenlagebericht

Jasper

Nov 28 – 29, 2017Parks Canada
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Archiviert · abgelaufen 9 years ago

Lawinengefahr

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

Snow and wind have developed a reactive layer that when triggered has the ability to step down to deeper instabilities. A cautious approach to avalanche terrain is recommended. 

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    Sensitive wind slabs building quickly at ridge tops and if triggered, has the potential to step down to the deeper instability.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–3
    This is a complex problem which is hard to assess and predict. Give yourself a wide margin and make conservative terrain choices. Below treeline this layer is only a concern if you are in a run out zone of a large avalanche path.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    Storms slabs continue to be an issues as the recent snow settles. Cooler temperatures over the next few days will help heal this problem.

Weather Forecast

A cooler and drier air mass is back over the region under a SW flow. Some flurries, moderate gusting strong (ridge top) winds. Overnight snow flurries with freezing levels to the valley bottom. Alpine lows of -13. Winds moderate SW gusting Strong.

Snowpack Summary

Storm slabs and windslabs have formed over the past 24 hours with wind effected snow specific to exposed lee features - these two problems sit on a recently developed rain crust 30 - 60 deep. A persistent slab between 40cm-150cm thick sits on the Halloween Crust, low in the snowpack. This crust can be found up to 2,700m depending on its location.

Avalanche Summary

Explosive control work on highway 93 produced results to sz 2.5. We observed avalanches releasing from new windslab as well as one deeper slab avalanche releasing on the Halloween crust. Minimal natural avalanche activity was noticed.

Confidence

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