Lawinenlagebericht

Jasper

Jan 28 – 29, 2015Parks Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

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

Cooling temperatures over the next 72 hours will reduce the avalanche danger as the freezing level drops.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    Heavy snow sits on the December weak layer. Any additional load such as a small point release can step down to this weak layer. Once the slide is moving, it will step down further to ground from the weight of the snowpack.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    Strong SW winds over the past 48 hours has  built slabs up to 60cm thick. This extra load combined with a skier will likely initiate an avalanche. As the wind reduce and temperatures drop the condition will improve.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2
    Cooling temperature will help to stabilize the moist snow which will occur most rapidly near treeline as the freezing level falls over the next 24 hours. Until this happens the snowpack at lower elevations will remain unstable and avalanche prone.

Weather Forecast

A drier and colder air mass is forecast to arrive on Wednesday. Freezing levels will fall to the valley bottom resulting in overnight freezing. Winds will be moderate from the west and south west.  Snow is expected on Friday in townsite area.

Snowpack Summary

Over the past 24 hours precipitation has fallen as rain below 2,400m. At treeline, the heavier snow sits over a persistent weak layer dating to Dec 20th. Below treeline, isothermic conditions exist.

Avalanche Summary

Avalanche control, at and above treeline, produced numerous slab avalanches up to size 3 along the icefield parkway. At times the avalanche was triggered before the explosives detonated. Below 1,800m moist point release to size 2 are traveling to mid runout. and taking the snowpack to ground.

Confidence

Freezing levels are uncertain on Wednesday

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