Lawinenlagebericht

Purcells

Mar 4 – 5, 2025Avalanche Canada
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Lawinengefahr

Thu
Fri
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Recent avalanche activity indicates the persistent weak layer remains triggerable.

Be especially cautious on high northerly slopes, and on sunny slopes during warming.

Lawinenprobleme

  • Wind Slabs

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

    Watch for small, newly formed and reactive wind slabs if you move into wind-affected terrain.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1.5–3

    Several active persistent weak layers exist, with the most problematic ones lying 30 to 60 cm deep. These layers were particularily reactive during the warmup, and remain a concern where thick, supportive surface crusts didn't form.

  • Loose Wet

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

    Back off slopes if the surface becomes wet with rising temperatures. Loose wet avalanches may step down to deeper layers, resulting in larger avalanches.

Confidence

Moderate

Avalanche Summary

Sun: A few persistent and loose wet releases size 1-2, with both human and natural triggers occurred.

Sat: Many natural, remote, and explosives-triggered slabs failed on the late-Jan layer, fitting a pattern of recent persistent activity, generally from size 2-3 at upper elevations.

Fri: A skier was caught in a size 1.5 and partially buried.

Wed: Size 2 - 3 deep persistent slabs were explosive-triggered, showing the basal snowpack reacting to large triggers.

Snowpack Summary

A trace to 10 cm of new snow from Monday has buried a melt-freeze crust which previously made up the surface on solar aspects and on all aspects below 1800 m. Wind-affected but dry snow still remains on high northerly slopes. A couple of weak layers consisting of a crust, facets or surface hoar from February and January remain a concern, buried 30 to 60 cm. Additionally, a layer of facets from early December is buried 70 to 120 cm. In many areas, facets or depth hoar exist at the base of the snowpack. These layers, particularly the late-January layer, remain a primary concern at upper elevations where strong surface crusts are absent.

Weather Summary

Monday Night

Partly cloudy with 0 to 5 cm of snow. 5 to 10 km/h variable ridgetop wind. Freezing level 1600 m dropping to valley bottom. Treeline temperature dropping to -7 °C.

Tuesday

A mix of sun and cloud. 5 to 10 km/h variable ridgetop wind. Freezing level rising to 1600 m. Treeline temperature around -4 °C.

Wednesday

Mainly cloudy with 2 to 10 cm of snow. 5 to 10 km/h west ridgetop wind. Freezing level rising to 1600 m, treeline temperature around -4 °C.

Thursday

Mostly sunny. 5 to 10 km/h north ridgetop wind. Freezing level rising to 1700 m. Treeline temperature around -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Keep in mind that human triggering may persist as natural avalanches taper off.

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