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Avalanche Forecast

Archived

Apr 10th, 2024–Apr 11th, 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.

Assess for fresh wind slabs near ridgetops before entering committing terrain.

Retreat to safer lower-angle terrain if you see blowing snow, or signs of instability.

Confidence

High

Avalanche Summary

No new avalanches have been reported.

On Saturday and Sunday, small loose dry avalanches, and potentially reactive wind loading were reported in steep, rocky, alpine terrain.

We expect wind slabs to remain a concern for a few more days in the alpine.

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

Snowpack Summary

Previous strong southerly winds combined with recent incremental snowfall have scoured southerly slopes and left deeper deposits of wind slabs on leeward faces. Forecast continued strong winds overnight may continue to build fresh slabs.

Up to 30 cm of soft snow on the surface may be found in sheltered upper-elevation areas, primarily north-facing terrain. Below this, expect to find firm wind-affected surfaces, a hard crust (below 1600 m), or loose powder snow.

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

Weather Summary

Wednesday Night

Mostly cloudy. 1 to 6 cm of snow possible. 30 to 50 km/h southeast ridgetop wind. Treeline low around -4°C.

Thursday

A mix of sun and cloud. Trace amounts of snow possible. 20 km/h south ridgetop wind. Treeline high around -1 °C. Freezing level rising to 900 m.

Friday

Partly cloudy. 1 to 6 cm of snow possible. 50 km/h southwest ridgetop wind. Treeline high around -3 °C.

Saturday

Cloudy. 2 to 7 cm of new snow possible. 50 km/h southwest 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.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Wind slabs are most reactive during their formation.

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.