Lawinenlagebericht

Northwest Inland

Apr 18 – 19, 2015Avalanche Canada
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Archiviert · abgelaufen 11 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
1 · Gering
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Kernpunkte

Cloud cover, warm alpine temperatures, localized solar radiation, and rain will deteriorate the snowpack. Use a conservative approach to terrain and watch for signs of instabilities.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    Strong winds have redistributed recent storm snow into wind slabs on leeward slopes. They are especially touchy where they sit on buried facets, surface hoar and/ or crusts. Cornices are large and may weaken with solar radiation.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    3–5
    Additional snow loading on the mid- March persistent weak layer could bring it back to life. Smaller slab avalanches may step down to this layer, initiating large and destructive avalanches.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–3
    Solar radiation and warmer temperatures will deteriorate the snowpack quickly. Travel on sunny slopes early, and watch for signs of instabilities like avalanches, moist surface snow and snowballing.

Confidence

Poor - Due to the number of field observations

Weather Forecast

Overcast tonight with periods of light precipitation combined with light southwest winds. Freezing levels should drop down to about 1200 metres overnight. Cloudy with light precipitation and light southwest winds during the day Sunday, freezing levels are expected to rise up to about 2200 metres. Moderate precipitation beginning overnight or early Monday morning with freezing levels around 1800 metres. Moderate precipitation continuing during the day Monday, probably rain up to at least 2000 metres. Warm and wet on Tuesday with strong southerly winds.

Avalanche Summary

Slab avalanches up to size 2 were reported in the Mt. Leach area on mostly north facing slopes. On Saturday, touchy wind slabs and storm slabs are likely, especially in areas that receive higher snowfall amounts. If the sun pokes out, solar radiation will be strong and deteriorate the upper snowpack. Watch overhead hazards like cornices, solar triggered loose and slab avalanches.

Snowpack Summary

Recent storm snow has likely formed touchy storm slabs. Strong westerly winds have redistributed this new snow and has formed wind slabs on leeward slopes and behind terrain features. Solar aspects may have a sun crust from recent localized solar radiation. The lack of bond between the new wind slabs and storm slabs over the older snow surfaces buried on April 9 th (surface hoar, crusts and facets) are the primary concern. The March 25th surface hoar / crust layer is reportedly unreactive, however; it should remain on your radar as it may re-awaken with the new load of snow, wind and effects from warming. Large ripe cornices are also of concern and will be a problem with additional loading, especially when the sun and warm temperatures come back.

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