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Avalanche Forecast

Archived

Dec 22nd, 2025–Dec 23rd, 2025

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Stick to sheltered, lower-angled terrain for the best and safest riding.

If over 25 cm falls overnight, think HIGH avalanche danger.

Confidence

Moderate

  • Forecast snowfall amounts are uncertain.

Avalanche Summary

As snowfall and wind increased on Sunday, riders were able to trigger size 1 storm slabs in steep terrain.

Looking forward to Tuesday, reactive storm slabs will be primed for human-triggering from snowfall and wind overnight on Monday.

Snowpack Summary

15 to 30 cm of new snow accompanied by strong southerly wind has left a variety of surfaces - wind slabs and loaded pockets in lee features, scoured rock in open terrain, and storm slabs and softer snow in sheltered areas.

This brings the past week's storm totals to 50 to 70 cm of new snow. This covers a crust that becomes increasingly supportive above 1700 m.

A deeper crust with associated facets, formed in mid-November, exists 50 to 150 cm below the surface and has been responsible for recent large avalanche activity.

Weather Summary

Monday Night
Mostly cloudy. 10 to 20 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -6 °C.

Tuesday
Mostly cloudy. 3 to 10 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -7 °C.

Wednesday
Mix of sun and clouds. 3 to 4 cm of snow. 10 km/h southeast ridgetop wind. Treeline temperature -9 °C.

Thursday
Mix of sun and clouds. 1 cm of snow. 10 km/h southeast ridgetop wind. Treeline temperature -9 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind-affected terrain.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

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.