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Avalanche Forecast

Archived

Apr 6th, 2024–Apr 7th, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West, Haines Pass.

Check for fresh wind slabs before committing to large features.

Consider mellower terrain if you see blowing snow, or signs of instability like shooting cracks and recent avalanches.

Confidence

High

Avalanche Summary

On Friday, several small (up to size 1.5) loose dry avalanches were reported in steep alpine terrain.

Please consider sharing photos and observations from your day on the Mountain Information Network.

Snowpack Summary

With light snowfall continuing, expect Up to 15 cm of soft snow on the surface. Below this, expect to find firm wind-affected surfaces, hard crusts, or loose powder snow (primarily in sheltered north-facing terrain).

Large, fragile cornices can be found on exposed ridgelines and should be given a wide berth.

Below 1300 m the recent snow overlies a widespread melt-freeze crust.

Weather Summary

Saturday Night

Mostly cloudy. 2 to 5 cm of snow expected. Moderate south ridgetop wind. Treeline low around -8°C.

Sunday

Mostly cloudy. 1 to 3 cm of snow expected. Light to moderate southeast ridgetop wind. Treeline temperature around -5 °C.

Monday

Mostly cloudy. 5 to 10 cm of snow expected. Strong south ridgetop wind. Treeline high around -3 °C.

Tuesday

Cloudy. 5 to 10 cm of snow expected in Haines Summit, 2 to 5 in White Pass. Moderate southwest ridgetop wind. Treeline high around -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.