Lawinenlagebericht

Northwest Coastal

Dec 18 – 19, 2022Avalanche Canada
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Archiviert · abgelaufen 4 years ago

Lawinengefahr

Tue
Wed
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Kernpunkte

Strong outflow winds are expected to affect treeline and above.

Be aware of the potential for reverse loading and encountering wind slabs on slopes you might not expect them.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2

    New slabs will likely form with northeasterly outflow winds. Winds slabs could overlie a weak layer of surface hoar, facets, and/or a crust. Any avalanche in the upper snowpack has the potential to scrub down to these deeper weak layers, making for larger-than-expected avalanches. This is especially relevant at treeline elevations, where surface hoar is more likely larger and better preserved.

Confidence

Moderate

Avalanche Summary

On Friday, small slabs avalanches (size 1) were triggered by skiers on steep wind-loaded slopes in the Zymacord area. If you venture into the backcountry, please consider submitting a MIN report, as it helps to strengthen our data gathering.

Snowpack Summary

Surfaces at upper elevations are highly wind-affected and variable at this time. In some parts of the region, a crust exists on south aspects after warm temperatures swept through this week. Dry snow still exists on northerly aspects at lower elevations.

A layer of large surface hoar crystals, buried in early December, is found down 20 to 50 cm. Although this layer has not been producing avalanches recently, reverse-loading may increase the likelihood of triggering.

The lower snowpack is well consolidated above the mid-November crust, found at treeline below 1200 m.

Weather Summary

An arctic front is sliding throughout the region. Gusty northerly winds and cold temperatures will persist into next week. Strong outflows are expected through the coastal inlets due to channelling effects.

Saturday night

Partly cloudy. Isolated flurries. Northeast wind 40 km/h gusting 60 km/h at ridge tops. Temperatures dropping to -15˚C.

Sunday

A mix of sun and cloud. Scattered flurries. Northeast wind 40 km/h at ridge tops. High of -20˚C.

Monday

Mainly sunny. No precipitation. Northeast wind 40 km/h at ridge tops. High of -22˚C.

Tuesday

Mainly sunny. No precipitation. Northeasterly wind 40 km/h at ridge tops. High of -24˚C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be carefull around freshly wind loaded features.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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