Lawinenlagebericht

Sea To Sky

Feb 1 – 2, 2012Avalanche Canada
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Archiviert · abgelaufen 15 years ago

Lawinengefahr

Fri
Sat
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–4
    Wind slabs are expected to settle and bond due to warm temperatures on Thursday. If the warm temperatures continue through the night on Thursday, the warming trend may be too rapid and cause instability on Friday.

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–6
    Strong winds and new snow have added mass to sensitive cornices. They may be destructive by themselves, and may also be a trigger for the slope below.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    1–5
    Storm slabs are expected to gain strength and continue to bond to the old surface. If the warm temperatures continue through the night on Thursday, the warming trend may be too rapid and cause instability on Friday.

Confidence

Fair - Freezing levels are uncertain on Friday

Weather Forecast

The freezing level is expected to drop down to about 600 metres by Thursday morning. Thin high clouds combined with light southerly winds and warm temperatures are forecast for Thursday. Warm temperatures with freezing levels up to about 1200 metres are expected to continue overnight into Friday. Friday is expected to be warm with light winds and high clouds. A weak pulse of precipitation may move into the region on Friday afternoon bringing trace amounts of snow to higher elevations. The ridge of high pressure is expected to re-build again on Saturday, bringing cooler temperatures. Mostly clear skies may produce intense solar radiation during the day on Saturday.

Avalanche Summary

Soft slab avalanches up to size 1.0, some skier controlled and some skier accidental on steep NE facing alpine terrain. One natural cornice reported as size 2.5 on a NE aspect in the alpine.

Snowpack Summary

The new snow has developed soft slabs in the alpine and at treeline. Storm slabs that developed on the weekend have gained significant strength, as have the heavy storm snow accumulations from last week. Cornices should also be on your radar as strong southwest winds and steady snowfall have contributed to impressive development. About a metre down there are a variety of older snow surfaces that formed throughout January. These surfaces include facets, old wind slabs, and crusts. These interfaces have also gained considerable strength, but triggering may be possible with a heavy load in isolated terrain. Previous concerns about deeper persistent weak layers appear to have diminished. Snowpack depths at treeline are in the region of 260 cm.

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