Lawinenlagebericht

Northwest Inland

Jan 16 – 17, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

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

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–4
    Strong westerly winds have created windslabs on lee terrain. With forecast snowfall and higher than normal wind values, watch for loading lower on the slope and in other unsuspecting locations.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–4
    Forecast snowfall will add additional load to buried weak layers. Watch for triggering in steeper, unsupported terrain.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–5
    A deeply buried facet/crust weakness exists near the base of the snowpack. This layer could be triggered by large loads such as a cornice collapse or from a thin-spot trigger point.

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

Tonight and Thursday: Light to moderate snowfall Wednesday and Thursday nights / Strong to extreme west winds / Freezing level at 800mFriday: Light snowfall / Moderate west winds /  Freezing level at 800mSaturday: Dry conditions with overcast skies / Light to moderate west winds / Freezing level at 1200m

Avalanche Summary

On Monday a size 2 windslab avalanche was skier-triggered in a chute above Crater Lake. The crown was about 30m wide with a maximum height of 80cm. On Tuesday a snowmobiler triggered a size 1 windslab on a slope which was reported to be "normally very stable". Reports suggest that the recent strong winds will be responsible for ongoing windslab activity.

Snowpack Summary

On the surface there are signs of recent intense northwest winds in the alpine and at treeline leaving scoured areas and hard windslabs on lee side of ridges and terrain breaks.  A surface hoar layer that was buried at the end of December is now down 60-80 cm, and has become reactive in some areas with recent warming. An otherwise strong mid-pack overlies a weak base layer of facets/depth hoar and the remnants of a crust.

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