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Avalanche Forecast

Archived

Mar 18th, 2025–Mar 19th, 2025

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

Regions

Coquihalla, Manning.

Fresh wind slabs will build throughout the day. Be mindful as you travel into lee terrain and near ridge crests, where slabs will be more reactive.

Confidence

Moderate

Avalanche Summary

Several wind slabs (size 1) were easily triggered by skiers on lee alpine and treeline features near Thar Peak on Sunday.

Loose avalanches also occurred (up to size 1.5) some sun-induced on steep southerly slopes and some fast-running dry sluffs on northerly slopes in the Coquihalla.

Thanks for sharing your observations via the MIN if you are going out into the backcountry.

Snowpack Summary

15 to 25 cm of recent snow exists, with deeper deposits of wind-transported snow in lee terrain. Southerly slopes have been sun-affected and the snow is moist and/or heavy snow. This sits over 75 cm of settling storm snow from the past week overlying a crust on all aspects except on high, north-facing alpine terrain.

A layer of facets and surface hoar that formed in February is now 90 to 150 cm deep, and a layer of facets and surface hoar from late January is 130 to 190 cm deep. No recent notable test results have been seen on these layers.

Weather Summary

Tuesday Night

Partly cloudy. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level at valley bottom.

Wednesday

Partly cloudy with isolated flurries. 30 to 50 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level rising to 1200 m.

Thursday

Cloudy with 10 to 15 cm of new snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -2°C. Freezing level 1200 m.

Friday

Cloudy with 15 to 25 cm of new snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.