Lawinenlagebericht

Purcells

Mar 8 – 9, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

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

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–5
    The soft slabs located below ridge tops and in open areas could become weaker especially on S facing slopes.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–6
    Persistent weak layers exist buried down 60-90 cm, comprising of surface hoar and a sun crust. A cornice fall could definitely trigger this layer..

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    Forecasted solar radiation and warmer temperatures will weaken the surface of the snow creating loose moist/wet avalanches.

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain on Sunday

Weather Forecast

Friday night and Saturday:  The dominating feature is a ridge of high pressure over the whole province bringing warmer air (-4 in the alpine), freezing levels rising to 1600 m., clear skies and light NW winds. Sunday: The ridge is breaking down in the North and remains in the Southern part of the interior range. There is a chance of light precipitation for Sunday (5-10 mm) with winds picking up in the moderate range from the W. Temperatures are slightly cooler than Saturday.Monday: Another system which could deliver more precipitation is expected for Monday but the timing and intensity is still uncertain.

Avalanche Summary

Several natural and skier triggered loose dry avalanches size 1 were reported which ran in the new snow in steep rocky terrain.

Snowpack Summary

The solar radiation and temperatures increasing tomorrow (especially in the Southern part of the region) will weaken the surface of the snowpack especially on S facing slopes. This could possibly trigger the recent wind slabs in the alpine lee areas and below lee ridgetop at treeline. Large looming cornices exist on ridgelines and could also be triggered by the warmth and sun creating a significant load on the slopes below. Buried beneath (60-90 cm) exists a surface hoar and a sun crust layer, which continue to be lingering concerns. A cornice fall could trigger this deeper instability potentially creating large avalanches.

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