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Archived

Avalanche Forecast

Jan 4th, 2025–Jan 5th, 2025
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Tutshi, Wheaton, White Pass East, White Pass West, Yukon.

Increasing winds will impact loose snow. Check for wind-loaded pockets around ridgecrests and steep rolls.

Confidence

Moderate

Avalanche Summary

On Wednesday this MIN post reported whumpfing and shooting cracks west of White Pass.

On Tuesday, our field team noted a natural size 2 slab avalanche on a north aspect at 1300m. (See photo below). The slab was 20-30 cm deep and failed on facets above a crust, the weak layer described in the snowpack summary.

Reports have been limited, if you head out in the mountains, please consider sharing your observations on the Mountain Information Network.

Snowpack Summary

Recent outflow winds have scoured windward faces in the alpine and loaded lee slopes. Up to 20 cm of soft snow can be found in sheltered areas.

The primary layer of concern is weak facets and in some cases surface hoar, overlying a crust. The interface is now buried 20 to 30 cm deep and extends up to 1750 m.

Despite the presence of faceted grains in the lower snowpack, there are no current layers of concern below the crust. 

Snowpack depths range from about 70 to 180 cm.

Weather Summary

Saturday night

Cloudy. 20 to 30 km/h south ridgetop wind. Treeline temperature -25 °C.

Sunday

Cloudy with isolated flurries, trace to 5 cm. 30, gusting to 60 km/h ridgetop southwest wind. Treeline temperature -16°C.

Monday

Cloudy with isolated flurries, 5 cm. 40 to 80 km/h ridgetop south wind. Treeline temperature -10°C.

Tuesday

Cloudy with isolated flurries, 5 cm. 40 to 80 km/h ridgetop south wind. Treeline temperature -10°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate big and steep terrain features before committing to them.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Keep in mind a buried crust offers an excellent bed surface for avalanches.

Avalanche Problems

Persistent Slabs

A crust with weak crystals overtop is buried 20 to 30 cm. This problem is specific to areas where a cohesive slab has formed over the layer, such as wind-loaded features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2