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Avalanche Forecast

Archived

Jan 30th, 2025–Jan 31st, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

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

Seek out areas with soft snow on the surface, and no large slopes above you.

Uncertainty about a buried weak layer warrants conservative terrain choices.

Confidence

Moderate

Avalanche Summary

No new avalanches were reported Wednesday or Tuesday. On Monday, a few size 1 to 2 natural avalanches occurred on northeast alpine slopes.

There have been no recent reports of persistent slab avalanches, but uncertainty remains. Snowpack test results and whumpfing suggest it may still be triggerable in some areas.

Snowpack Summary

Up to 25 cm of new snow fell between Monday and Wednesday. Expect lesser amounts of new snow the further inland you go. It came with strong southwest wind that has switched to northeast. Watch for reverse loaded slopes hiding pockets of windslab

A weak layer of facets and a crust from early December is buried 50 to 100 cm deep. This layer exists on all aspects up to around 1700 m.

At the highway elevation the snow is 120 cm deep and in the alpine there is more than 200 cm.

Weather Summary

Thursday Night

Mostly cloudy with flurries. 20 to 30 km/h east ridgetop wind. Treeline temperature -20 °C.

Friday

Mix of sun and cloud. 30 to 50 km/h northeast ridgetop wind. Treeline temperature -25 °C.

Saturday

Mostly sunny. 40 to 60 km/h ridgetop wind. Treeline temperature -26 °C.

Sunday

Partly sunny. 50 km/h north ridgetop wind. Treeline temperature -30 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Avoid freshly wind-loaded terrain features.

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.

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.