Lawinenlagebericht

Northwest Inland

Mar 15 – 16, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig

Kernpunkte

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–5
    Pockets of wind/lingering storm slab exist on wind exposed features.  This problem is most prevalent on steep wind exposed features in the alpine and unsupported/convex slopes at all elevations.

Confidence

Poor - Due to limited field observations

Weather Forecast

Synopsis:  The pattern calms down a bit becoming drier and colder, although most of the Arctic Air should flush out by Sunday.Saturday:  Freezing Level: 500m Precip: 2-4mm/4-8cm Wind: W, Light gusting Moderate+.Sunday:  Freezing Level: Surface Precip: trace Wind: NW, LightMonday: Freezing Level: 400m Precip: 3-5mm/6-10cm Wind: SE, Light

Avalanche Summary

No avalanches were reported on Thursday from the region.  In the neighboring Northwest Coastal region a bit of sluffing from steep terrain was reported Thursday along with a natural size 1 avalanche from a wind loaded pocket below a small cornice that failed on the March 9th surface hoar.  In the southern portion of the region a couple large glide slabs failed resulting in large (size 3) avalanches.

Snowpack Summary

20 - 40cm of unconsolidated storm snow rests on the old/new snow interface.  Prior to this last storm, the surface was a mix of crusts, old wind slabs and fairly widespread large surface hoar (which we're calling the March 9th surface hoar).  Professionals in the region are keeping their eyes on this layer and testing produces sudden collapse failures at this interface.  In many places, the storm snow has not yet taken on any slab characteristics, but there are no doubt some locations where the storm snow has been massaged into a more cohesive slab.  As a result the current slab problem is "pockety" in nature.  You'll need to dig down to the old surface and test it to get a feel for what's happening in your particular drainage.  The mid snowpack is generally well settled and strong.

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