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Avalanche Forecast

Archived

Mar 6th, 2025–Mar 7th, 2025

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

Regions

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

New snow and wind are forming fresh, reactive slabs in leeward terrain features. Seek out wind-sheltered terrain for the best and safest riding.

Confidence

Moderate

Avalanche Summary

On Monday a size 1.5 wind slab was observed in the White Pass. On Sunday, size 2 avalanches were reported in the Three Guardsman area of Haines Summit.

Looking forward, wind slabs are likely to be reactive naturally and to rider triggers.

Snowpack Summary

15 to 25 cm of new snow sits over a variety of surfaces, including a melt-freeze crust on solar slopes and hard wind-affected surfaces or faceted snow and surface hoar on shady slopes. Strong southwesterly winds have loaded deeper deposits on lee slopes.

A weak layer of facets and a crust from early December is buried 60 to 150 cm deep on all aspects up to 1750 m. This layer has not produced recent avalanche activity or test results and is not currently a concern.

Snow depth varies from 100 cm at highway elevations to over 200 cm in the alpine.

Weather Summary

Thursday night

Cloudy with a trace of snow. 30 to 40 km/h south ridgetop wind. Treeline temperature -5 °C.

Friday

Mostly cloudy with 10 to 15 cm of snow. 40 to 50 km/h southeast ridgetop wind. Treeline temperature -5 °C.

Saturday

Partly cloudy with a trace of snow. 20 to 40 km/h southeast ridgetop wind. Treeline temperature -5 °C.

Sunday

Partly cloudy. 20 to 30 km/h southeast ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.

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.