Lawinenlagebericht

Northwest Inland

Avalanche Canada
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Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 4 months ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Slab avalanches are possible on high-elevation north-facing slopes where dry snow exists.

Loose wet avalanches are expected with high freezing levels and little to no overnight refreeze.

Lawinenprobleme

  • Wind Slabs

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

    Wind slabs formed earlier in the week persist. New snow and strengthening winds over the weekend may create additional wind slabs in some areas.

  • Persistent Slabs

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

    A layer of weak faceted snow with a firm crust is buried 100 to 200 cm deep. Recent avalanches on this layer were triggered by strong solar input and warm temperatures. The greatest concern for triggering exists in rocky alpine start zones.

  • Loose Wet

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

    Wet loose avalanches are most likely during periods of direct solar input and as temperatures rise later in the day.

Confidence

Moderate

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.
  • We are uncertain due to a limited number of field observations.

Avalanche Summary

Several loose wet avalanches, up to size 2, were reported on Friday during periods of warming and sun exposure.

On Wednesday in the Seaton area, numerous natural wind slab avalanches up to size 2 were observed. A large (size 2.5) naturally triggered persistent slab avalanche on a south-facing slope at 1800 m was reported.

If you’re heading into the backcountry, please consider submitting a MIN report—observations are particularly limited this time of year.

Snowpack Summary

On northerly, shaded alpine terrain, up to 30 cm of recent snow is continuing to settle and bond over a crust formed earlier in April. This early-April crust is strong and supportive at elevations of 1600 m and below, but gets thinner and weaker at higher elevations. Crusty surfaces are expected on sun-exposed slopes and at lower elevations.

A layer of weak, sugary snow over a thick crust is buried 100 to 200 cm and continues to produce large, surprising avalanches.

Check out this Conditions Update video for tips on managing the current spring conditions.

Weather Summary

Saturday Night
Mostly cloudy. 1 to 4 mm of precipitation as snow or rain at treeline. 30 km/h south ridgetop wind. Treeline temperature 1 °C. Freezing level 1600 m.

Sunday
Cloudy. 1 to 4 mm of precipitation as snow or rain at treeline. 50 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Monday
Mix of sun and clouds. 1 to 2 mm of rain at treeline. 40 km/h west ridgetop wind. Treeline temperature 2 °C. Freezing level 1700 m.

Tuesday
Mostly sunny. 1 mm of precipitation as snow or rain at treeline. 30 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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