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Avalanche Forecast

Archived

Feb 11th, 2025–Feb 12th, 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.
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.

Continuously assess conditions as you move through terrain.

Avoid thin-to-thick areas like rocky outcrops where you're more likely to trigger avalanches on weak layers.

Confidence

Moderate

Avalanche Summary

There have been no new persistent slab avalanches reported in the past week, but uncertainty remains regarding the early December layer mentioned in the snowpack summary.

If you're heading into the backcountry please consider making a MIN report with your observations and photos from the day. All information is helpful for forecasters!

Snowpack Summary

Previous strong outflow wind has impacted the snow surface in exposed terrain on all aspects and elevations. Ongoing cold temperatures have softened the upper snowpack in sheltered terrain.

A weak layer of facets and a crust from early December is buried 60 to 100 cm deep. This layer exists on all aspects up to 1750 m.

At the highway elevation the snow is 120 cm deep and in the alpine exceeds 200 cm.

Weather Summary

Tuesday Night

Clear. 10 to 15 km/h northwest ridgetop wind. Treeline temperature -10 °C, strong temperature inversion with a high of -5 °C in the alpine.

Wednesday

Mainly sunny. 10 to 25 km/h northwest ridgetop wind. Temperature inversion, treeline temperature -15 °C, with a high of -10 °C in the alpine.

Thursday

Mainly cloudy with isolated flurries, 1 cm of snow. 15 to 25 km/h southeast ridgetop wind. Treeline temperature -15 °C.

Friday

Mainly cloudy with isolated flurries, 1 to 2 cm of snow. 30 to 40 km/h south ridgetop wind. Treeline temperature -20 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Be aware of the potential for large avalanches due to a buried crust.
  • Cornice failures could trigger large and destructive avalanches.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.