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Avalanche Forecast

Archived

Mar 5th, 2025–Mar 6th, 2025

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, 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.

New snow and wind will be building reactive slabs.

Seek out sheltered terrain for the best and safest riding.

Confidence

High

Avalanche Summary

Looking forward, storm slabs are expected to be reactive to human-triggering, especially where southwesterly winds have created deeper deposits on north- and east-facing slopes.

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.

Snowpack Summary

Up to 20 cm of new snow is expected to fall by the end of the day on Thursday. Strong southwesterly winds are expected to create deeper and reactive deposits on lee slopes. This snow falls on a variety of different surfaces, including a melt-freeze crust on solar slopes and hard wind-affected surfaces or faceted snow and surface hoar on shady 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

Wednesday Night

Cloudy with 5 to 10 cm of snow. 60 to 80 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Thursday

Cloudy with 5 to 10 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Friday

Mostly cloudy with 3 to 5 of snow. 30 km/h southerly wind. Treeline temperature -5 °C.

Saturday

Cloudy with 5 to 10 cm of snow. 30 km/h south ridgetop winds. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • 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.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.