Lawinenlagebericht

Microwave-Sinclair

Feb 27 – 28, 2025Avalanche Canada
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Lawinengefahr

Sat
Sun
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
1 · Gering
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Kernpunkte

New snow, wind and warming will likely stiffen the upper snowpack creating reactive wind and persistent slabs.

A conservative approach to terrain is critical.

Lawinenprobleme

  • Wind Slabs

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

    Fresh and reactive wind slabs are likely. Wind slabs will be the most sensitive where they overlie facets.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2.5

    Concerning weak layers formed in January and February. They exist in the upper 80 cm of the snowpack. New snow, wind and warming will add stress to these layers and may become reactive.

Snowpack Summary

Recent strong southerly winds and 5 to 15 cm of new snow have formed fresh wind slabs on leeward slopes.

40 to 60 cm of snow now sits above a variety of old snow surfaces including soft, faceted snow in sheltered terrain and wind-affected snow in exposed terrain. This layer is showing reactivity in recent snowpack testing.

A facet/crust layer from early December is buried approximately 70 to 110 cm deep. This layer is generally not a concern in this region at this time.

Confidence

Moderate

Avalanche Summary

On Tuesday, a rider triggered wind slab (size 2) was reported on the MIN. This occurred at treeline on a southeast aspect.

Weather Summary

Wednesday Night

New snow 5 to 15 cm. 45 gusting to 80 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1100 m.

Thursday

Mix of sun and cloud with snow 2 to 5 cm. 10 to 45 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Friday

Cloudy with snow 3 to 5 cm. 10 to 60 km/h south ridgetop wind. Treeline temperature -4°C. Freezing level valley bottom.

Saturday

Mix of sun and cloud with isolated flurries. 10 km west ridgetop wind. Treeline temperature -1 °C. Freezing level 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Conservative terrain selection is critical; choose gentle, low consequence lines.

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