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Avalanche Forecast

Archived

Jan 14th, 2025–Jan 15th, 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 unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

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

Strong wind and abundant storm snow are driving the avalanche hazard. Natural avalanches may be seen on Wednesday and human-triggered avalanches are likely.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported due to poor visibility and stormy weather.

Natural avalanche activity may persist on Wednesday and human-triggered avalanches remain likely.

Snowpack Summary

In the past 72 hours, 30 to 60 cm of storm snow accompanied by strong southerly wind hit the region. White Pass received the higher amounts of snow, but the Wheaton and Tutshi areas weren't far behind. Warmer temperatures will help promote settlement in the recent snow but it may bond slowly, as it rests on weak facets and, in some isolated areas, on surface hoar. A thin melt-freeze crust exists at lower elevations that saw rain.

A persistent weak layer consisting of a crust with 20 cm of faceted snow above it is buried 60 to 100 cm, and extends up to 1700 m.

Total snow depths are around 100–180 cm at treeline.

Weather Summary

Tuesday Night

Mostly cloudy. 30 to 50 km/h northwest ridgetop wind. Treeline temperature -8 °C. Freezing levels fall to valley bottom.

Wednesday

Mix of sun and cloud. 10 to 30 km/h southeast ridgetop wind. Treeline temperature -10 °C.

Thursday

Cloudy with 5 to 10 cm. 20 to 40 km/h northeast ridgetop wind. Treeline temperature -15 °C.

Friday

Clearing. 20 to 40 km/h northwest ridgetop wind. Treeline temperature -15 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.