Lawinenlagebericht

South Rockies

Avalanche Canada
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Lawinengefahr

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

Cornice failures may trigger very large persistent slabs on the slopes below.

Avoid steep, rocky, and wind-affected areas where triggering persistent slabs is more likely.

Lawinenprobleme

  • Cornices

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

    Cornice failures could trigger very large persistent slabs on the slopes below.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–3

    Weak facets over a hard melt-freeze crust may be found 50 to 70 cm deep. Triggering this layer is most likely on steep slopes with a shallow snowpack or with a large trigger, like a falling cornice.

  • Loose Wet

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

    Very high freezing levels will increase the likelihood of wet avalanches.

Confidence

Moderate

  • We are uncertain about how persistent slabs will react to the forecast weather.

Avalanche Summary

No new avalanches were reported on Thursday.

On Wednesday, our field team reported a very large (size 2.5) persistent slab avalanche triggered by a cornice fall on Window Mountain. It likely occurred on Tuesday. See photo below.

Observations from this region are currently very limited. Please consider submitting a MIN to let us know what you're seeing out there.

Snowpack Summary

Poor overnight crust recovery caused by cloudy skies and very high freezing levels are increasing the likelihood of cornice failures and wet avalanches.

Moist snow surfaces exist up to mountain tops.

Triggering persistent slab avalanches in the alpine on weak facets above a crust down 50 to 70 cm remains a concern. These are most likely to be triggered by heavy loads (like a cornice) or a snowmobile in steep, rocky, alpine terrain.

Facets exist at the base of the snowpack in shallow areas.

Snowpack depth tapers rapidly at lower elevations.

Weather Summary

Friday Night
Clear skies. 20 km/h southwest ridgetop wind. Treeline temperature 4 °C. Freezing level 3000 m.

Saturday
Mix of sun and clouds. 30 km/h southwest ridgetop wind. Treeline temperature 5 °C. Freezing level 3100 m.

Sunday
Mostly cloudy. 0 to 5 cm of snow above 2000 m (rain below). 20 km/h southwest ridgetop wind. Treeline temperature 1 °C. Freezing level 2300 m.

Monday
Mostly cloudy. 20 km/h southwest ridgetop wind. Treeline temperature 1 °C. Freezing level 2200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Cornice failures could trigger large and destructive avalanches.
  • Avoid travelling on slopes below cornices.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Avalanches could start at higher elevations and travel into below treeline terrain.

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