Lawinenlagebericht

North Rockies

Mar 13 – 14, 2024Avalanche Canada
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Lawinengefahr

Fri
Sat
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Kernpunkte

Strong wind will likely build reactive wind slabs.

Rider and remote triggering of large avalanches are an ongoing concern. Choose conservative, low consequence terrain.

Lawinenprobleme

  • Wind Slabs

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

    Ongoing snowfall and southerly wind have formed wind slab on northerly aspects and cross loaded others.

    These avalanches have the potential to step down to deeper layers if triggered.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1.5–2.5

    A weak layer of facets rests above a hard-melt freeze crust that formed early February. This layer remains in the depth for human triggering.

Confidence

Moderate

Avalanche Summary

On Tuesday, a few natural wind slabs on north facing slopes and persistent slabs on south facing slopes up to size 1.5 were reported. Numerous explosive controlled persistent slab avalanches up to size 3 were triggered on northerly aspects at treeline and above.

We expect wind and persistent slabs to be rider triggerable. Avoid solar slopes when the sun is out.

Snowpack Summary

A melt-freeze crust may exist on the surface up to 1400 m and higher on steep south facing slopes.

At treeline and above, the recent storm snow is being redistributed by ongoing southerly winds, leaving widespread wind-affected surfaces in exposed terrain and wind slabs on leeward terrain.

A thick and hard widespread crust that formed in early February is buried about 50 to 110 cm deep. This crust has a layer of facets above it in many areas.

The eastern portion of this region is much shallower with a highly variable and wind-affected snowpack.

Weather Summary

Wednesday Night

Mostly cloudy with isolated flurries 5-10 cm. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -5°C. Freezing levels 1200 m.

Thursday

Mix of sun and cloud with isolated flurries 5-10 cm. 20 to 40 km/h southwest ridgetop wind. Treeline temperatures near -1°C. Freezing level rising to 1800 m.

Friday

A mix of sun and cloud. 40 to 60 km/h northwest ridgetop wind. Treeline temperatures near above zero degrees. Freezing level rising to 2500 m.

Saturday

Sunny. 15 km/h northwest ridgetop wind. Treeline temperatures above zero degrees. Freezing level rising to 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Choose conservative terrain and watch for clues of instability.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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