Lawinenlagebericht

Northwest Inland

Dec 28 – 29, 2013Avalanche Canada
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Archiviert · abgelaufen 13 years ago

Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    New touchy wind slabs may develop with forecast snowfall and strong mountaintop winds over the next couple days.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–5
    There is not much news on the buried mid-December rain crust. Watch for clues of instability and be prepared to dig and investigate if you plan on venturing into more committing terrain.

Snowpack Summary

Recent storm snow totals in the region are around 40-50 cm, with moist or wet snow below treeline. Periods of moderate to strong W-SW winds were likely over the past couple days. Expect dense wind slabs in exposed lee terrain and cross-loaded features. Between 40 and 80 cm of snow sits on a crust that extends up to treeline and possibly beyond. This interface was "popping" under easy loads in snowpack tests a few days ago. A new surface rain crust will probably form at lower elevations as temperatures cool tonight. Deeper in the snow pack a layer of facets/surface hoar formed in early December can be found in the top 100cm in the Ashman. The mid and lower snowpack is still structurally weak and faceted. Depth hoar and an early season crust exist near the ground.

Confidence

Poor - Due to the number of field observations

Weather Forecast

Tonight and Sunday: Mainly cloudy with light snow – 5-10 cm. The freezing level is around 1000 m but there is a chance of an above freezing layer near 1500 m. Winds are moderate to strong from the W-SW. Monday: Periods of snow – around 10 cm. The freezing level is near 1000 m and winds are moderate from the SW. Tuesday: Mainly cloudy with a chance of flurries and sunny breaks late in the day. The freezing level is near valley bottom.

Avalanche Summary

No new avalanches have been reported, but observations from the region are very limited. Areas with heavier recent snowfall likely experienced a natural avalanche cycle on Thursday/Friday. Rider triggering remains a concern in steeper terrain and wind loaded features, primarily at and above treeline.

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