Lawinenlagebericht

Sea To Sky

Mar 31 – Apr 1, 2025Avalanche Canada
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Archiviert · abgelaufen 2 years ago

Lawinengefahr

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

Watch for reactive wind slabs at higher elevations.

Large avalanches on buried weak layers remain possible—avoid shallow, rocky terrain and minimize exposure to cornices.

Lawinenprobleme

  • Wind Slabs

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

    Deeper deposits of recent storm snow may remain reactive near ridgelines.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–3.5

    Weak layers remain a concern, especially in north-facing terrain & where snowpack depth is variable. They have recently produced large avalanches and may be triggered by cornices or humans in steep, shallow terrain at upper elevations.

Confidence

Moderate

Avalanche Summary

A widespread avalanche cycle occurred during the recent warm-up to size 4, with many stepping down to persistent weak layers. Natural avalanche activity has tapered off, but human-triggered avalanches on these layers remain possible.

On Sunday, cornice falls produced a size 1.5 in the Musical Bumps, and a size 2.5 slab on Tremor (photo below). Small rider-triggered wind slabs were also reported.

Snowpack Summary

10 to 20 cm of wind-affected dry snow exists at high elevations, sitting over the recent melt freeze crust. Below this, the upper snowpack remains wet.

Several persistent weak layers from January, February, and March can be found between 1 and 3 m deep in the Sea to Sky, and up to 2 m deep in the Duffy. These layers were very reactive during the warm spell last week.

At lower elevations, the rain-saturated snowpack tapers quickly with elevation.

Weather Summary

Monday Night

Mostly cloudy with possible flurries. 20 to 30 km/h northwest ridgetop winds. Freezing level 1000 m.

Tuesday

Mostly cloudy. 30 to 40 km/h northwest ridgetop winds. Treeline temperature -2 °C. Freezing level 1500 m.

Wednesday

A mix of sun and cloud. 10 km/h variable ridgetop winds. Treeline temperature -2 °C. Freezing level 1500 m.

Wednesday

Clear skies. 30 to 40 km/h northeast ridgetop winds. Treeline temperature+1 °C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.

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