Lawinenlagebericht

Jasper

Dec 26 – 27, 2018Parks Canada
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Archiviert · abgelaufen 8 years ago

Lawinengefahr

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

Avoid placing yourself under any terrain with cornices overhead as several failures have occurred recently producing large avalanches.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2.5
    Winds have abated on all but the highest ridge tops where slabs will be at their most developed.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    The new snow from last week is settling and the interface with the old snow surface, buried up to a meter deep, is strengthening. Large triggers such as cornices have produced several releases in the past 48hrs.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1.5–3
    The base of the snowpack is weak and facetted.  Likely trigger locations are around rocks, where cold air can penetrate to the base of the snowpack, and shallow snowpack  locations.

Weather Forecast

Little change is expected in over the holidays, forecasted winds will remain light and variable as arctic air seeps into the region during the next few days. Temperatures will remain cool as the sun traverses low to the horizon with  highs of -10C and overnight lows of -17C. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Last weeks storm snow is providing support underfoot to mountain travelers. Snow conditions at treeline are variable from power, in sheltered areas, to slabs in exposed locations and near ridges.  The Dec. 11th persistent weak layer is buried 50-100cm. The deep persistent weakness lingers near the ground in the depth hoar and facets.

Avalanche Summary

Several deep releases from the alpine and been observed in the Icefields area. These avalanches are up to size 3 and appear to have been triggered by cornice failures from South Easterly facing slopes. It is likely these occurred at the interface of last weeks snow and then stepped down to the deep persistent interface at the base of the snowpack.

Confidence

Due to the number of field observations

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