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Avalanche Forecast

Archived

Apr 8th, 2024–Apr 9th, 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.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

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

Check for 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 Saturday and Sunday, a small loose dry avalanche, and potentially reactive wind loading were reported in steep, rocky, alpine terrain.

Looking forward to Tuesday, similar conditions are likely.

Thanks for sharing your photos and observations on the Mountain Information Network.

Snowpack Summary

With light snowfall and moderate wind continuing, expect up to 25 cm of soft snow on the surface in sheltered areas, and deeper deposits of wind slab in leeward terrain. 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

Monday Night

Mostly cloudy. 0 to 3 cm of snow expected. Light to moderate southwest ridgetop wind. Treeline low around -7 °C.

Tuesday

Cloudy. 0 to 3 cm of snow expected. Moderate southwest ridgetop wind. Treeline high around -4 °C.

Wednesday

Mostly cloudy. 5 to 10 cm of snow expected, less closer to Carcross. Moderate south ridgetop wind. Treeline high around -2 °C.

Thursday

Mostly sunny. 1 to 3 cm of snow expected. Light south ridgetop wind. Treeline high around -2 °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.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.
  • 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.