Lawinenlagebericht

Northwest Coastal

Dec 28 – 29, 2016Avalanche Canada
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Lawinengefahr

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

Significant accumulations of new snow will remain touchy, particularly in wind drifted areas, or in sheltered areas where it overlies a weak snowpack layer.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–4
    The additional load of storm snow may make it possible to trigger deeper weak layers that formed in isolated areas during the early December cold snap. These weak layers include facets and surface hoar that are buried 100-150 cm deep.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2–3
    Storm slabs are 50-80 cm thick and growing with ongoing flurries and strong winds in the forecast. Storm slabs will be extra touchy in sheltered areas around treeline where they sit above preserved surface hoar.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

THURSDAY: Light snow 5-10 cm, winds around 40 km/h from the southeast. Treeline temperatures around -7C.FRIDAY: Mix of sun and cloud, 40-60 km/h northwest winds, temperatures around -8C in the south of the region, colder further north.SATURDAY: An overnight storm may put up to 10 cm on the ground for Saturday morning, then clearing with 40-60 km/h northeast winds.

Avalanche Summary

An avalanche cycle was reported from the Terrace area during Monday and Tuesday's storm, although notably most of the avalanches appeared to be loose dry avalanches. Avalanches up to size 2.5 were also reported from the Ningunsaw area.

Snowpack Summary

Recent storms have deposited 50-80 cm new snow combined with strong, mainly southwest winds. Expect touchy wind slabs to have formed in the lee of exposed ridges. The storm snow has buried a layer of feathery surface hoar (up to 15 mm in sheltered areas), making wide propagations possible. A weak interface that formed during the early December cold snap can be found in isolated areas buried 100-150 cm deep. The layer consists of preserved surface hoar or weak faceted (sugary) snow. The lower snowpack is well consolidated in deep snowpack areas. In shallow snowpack areas, such as the northern part of the region, an old rain crust near the bottom of the snowpack has developed weak facets and might be triggerable from a thin or rocky area on a convex slope.

Abgedeckte Regionen