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Avalanche Forecast

Archived

Dec 19th, 2025–Dec 20th, 2025

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

Regions

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

Continued flurries and steady winds will keep the avalanche hazard elevated.

Confidence

Moderate

  • Uncertainty is due to how quickly the snowpack will recover and gain strength.
  • Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Avalanche Summary

No new avalanches were reported in the region since Monday.

In the adjacent Sea to Sky, ski cut and explosives-controlled slab and loose dry results to size 1.5 have occurred on the most recently buried crust.

On Monday, several large (size 2.5 to 3) natural avalanches occurred along the Duffey corridor. These all failed on the mid-November crust and facet layer.

Snowpack Summary

Approximately 30 to 50 cm of recent storm snow has accumulated, accompanied by strong alpine winds.

This new snow has buried a thin melt-freeze crust in most areas, with wet, dense snow sitting below.

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

Friday night
Cloudy. 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Saturday
Mostly cloudy. 10 to 15 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

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

Monday
Cloudy. 10 to 30 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be especially cautious as you transition into wind-affected terrain.
  • 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.