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Avalanche Forecast

Archived

Mar 4th, 2025–Mar 5th, 2025

Alpine
Natural avalanches unlikely.
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.

Wind slabs are likely becoming harder to trigger.

Continue to approach ridgelines with caution, slabs may remain reactive where they sit over weak and faceted snow.

Confidence

Moderate

Avalanche Summary

A size 1.5 wind slab was observed yesterday, see photo below.

On Sunday, size 2 avalanches were reported in the Three Guardsman area of Haines Summit. And on Saturday, several size 1.5 wind slabs and a size 2.5 storm slab avalanche were reported in the Big Kahuna area.

Looking forward, wind slabs are expected to become less likely to trigger.

Snowpack Summary

30 cm of recent snowfall has been heavily affected by strong southerly winds. This sits over firm, wind-affected surfaces in exposed areas, faceted (weak) snow in sheltered terrain, and a crust on steep solar aspects. A poor bond to these interfaces may exist.

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 120 cm at highway elevations to over 200 cm in the alpine.

Weather Summary

Tuesday Night

Partly cloudy. 20 to 30 km/h south ridgetop wind.

Wednesday

A mix of sun and cloud. 30 km/h southwest ridgetop winds, increasing to 60 km/h in the afternoon. Treeline temperature -2 °C.

Thursday

Up to 8 cm of snow by Thursday morning.

Mostly cloudy with up to 5 cm of snow over the day. 50 to 70 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Friday

Mostly cloudy with up to 7 cm of snow. 50 to 60 km/h southerly wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • 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.