Lawinenlagebericht

Northwest Coastal

Jan 19 – 20, 2015Avalanche Canada
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Archiviert · abgelaufen 12 years ago

Lawinengefahr

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

The storm track is aimed at the Northwest this week resulting in rising avalanche danger. Avoid avalanche terrain during periods of heavy loading from snow, rain or wind.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–4
    Fresh wind slabs will continue to build in wind exposed terrain throughout the week with forecasted snowfall and strong SW winds.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–4
    Storm slabs may become sensitive to rider triggering as snow accumulates and temperatures gradually rise. Wet loose sluffs or wet slabs are possible below treeline if we start to see heavy rain at lower elevations. 

Confidence

Fair

Weather Forecast

Synopsis: The storm track looks like it will be aimed squarely at the Northwest for the next few days bringing a series of frontal systems. Expect 10-20 cm of snow on Tuesday, another 25-40 cm (or mm) Tuesday night through Wednesday, and it keeps coming down on Thursday. We should see a warming trend with freezing levels around 1200-1400 m on Tuesday, and 1500-1600 m on Wednesday/Thursday. Winds should be consistently moderate or strong from the S-SW.

Avalanche Summary

Most of the recent reported activity was from the north of the region. Numerous explosive triggered size 1-2.5 slabs were reported on Saturday and Sunday. Many of these were on wind-loaded N-NE aspects around 1400-1500 m. There were also a few natural cornice falls which triggered 10 cm deep slabs below. It's likely that southern sections also experienced recent natural avalanche activity but poor weather may have prevented observations.

Snowpack Summary

Strong winds have redistributed recent storm snow into wind slabs, and rain has saturated the surface of the snowpack to around 1000 m. If temperatures cool, the snowpack below treeline may gain some strength. Above treeline, a buried rain crust and/or surface hoar layer is down about 50 cm. Observations of the strength at this interface have been limited. The November crust near the bottom of the snowpack is generally well bonded, but may still be reactive in areas with a shallow snowpack, or with a very heavy load.

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