Lawinenlagebericht

Brandywine

Mar 29 – 30, 2025Avalanche Canada
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Lawinengefahr

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

Sunshine can have a powerful effect on stability - and your desire to push into aggressive terrain. Deep instabilities are still present and have produced recent large avalanches.

Lawinenprobleme

  • Wind Slabs

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

    Watch for pockets of reactive slab where recent storm snow has been deposited in leeward terrain features at upper elevations.

  • Persistent Slabs

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

    A weak layer from early March is 100 to 150 cm deep, and the Jan & Feb layers are buried 200 to 300 cm. These remain a concern, especially in northerly alpine terrain. These layers have caused recent very large avalanches in the region.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–1.5

    Wet loose avalanches are possible in recent snow on steep sun exposed slopes.

Confidence

Moderate

Avalanche Summary

A widespread, very large avalanche cycle (up to size 4) occurred throughout the region on Tuesday and Wednesday. Many slabs failed on or stepped down to persistent weak layers.

On Thursday, a few natural and human-triggered size 1-2 storm slabs were observed. By Friday, storm slab activity was limited to explosive control work. Small natural and skier-triggered loose wet were also reported.

Snowpack Summary

10 to 20 cm of snow from Saturday sits over a crust capping a wet upper snowpack. At wind-exposed elevations, southerly wind has likely redistributed the recent snow into deeper deposits on northerly aspects.

Several persistent weak layers from January, February and March can be found between 1 and 3 m deep. These layers were very reactive during the warm spell last week. Below this, the snowpack is well-settled and strong.

Weather Summary

Saturday night

Clearing. 10 to 20 km/h southeast ridgetop winds. Treeline temperature -3 °C. Freezing level around 1200 m.

Sunday

Mostly sunny. 30 to 40 km/h southeast ridgetop winds. Treeline temperature +2 °C. Freezing level rising to 1900 m.

Monday

Cloudy, with 2 to 6 cm of snow above 1200 m, light rain below. 10 to 25 km/h variable ridgetop winds. Treeline temperature -2 °C. Freezing level 1400 m.

Tuesday

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

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

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