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Avalanche Forecast

Archived

Jan 26th, 2025–Jan 27th, 2025

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

Regions

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

New snow and wind will build slabs throughout the day.

Keep in mind a buried weak layer exists and there is the potential for large avalanches.

Confidence

Moderate

Avalanche Summary

No avalanches have been reported since Jan 22nd.

It has been a while since a persistent slab avalanche has been reported, however, with new snow on the way it's possible that large avalanches will occur.

Snowpack Summary

New snow is expected to fall with strong southwest wind, building slabs on lee slopes through the day. Expect lesser amounts of new snow the further east you go.

New snow falls on a heavily wind-modified surface with some soft snow remaining in sheltered spots.

A weak layer of facets and a crust from early December is buried 80 to 140 cm deep. This layer exists on all aspects up to around 1700 m and produced large avalanches last weekend.

Weather Summary

Sunday Night

Cloudy with 5 to 10 cm of snow. 50 to 80 km/h south ridgetop wind. Treeline temperature -5 °C.

Monday

Mostly cloudy with 10 to 20 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Tuesday

Mostly cloudy with 5 to 15 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Wednesday

Mostly clear skies. 10 km/h northeast ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid freshly wind-loaded terrain features.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger 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.

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.