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Avalanche Forecast

Archived

Mar 11th, 2025–Mar 12th, 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 possible, human triggered probable.
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.

The new storm snow is not bonding well to old surfaces, and human-triggered avalanches are likely on Wednesday.Stick to conservative terrain and watch for signs of instability.

Confidence

Moderate

Avalanche Summary

On Monday, observations noted a widespread natural and explosive control avalanche cycle up to size 3.

Reactive storm slabs are likely on Wednesday. Especially in areas at upper elevations that see more wind effect. Dry loose sluffing will exist in steep terrain features.

Snowpack Summary

Up to 70 cm of snow above a crust on all aspects except on high north facing terrain, where new snow buries 5 cm of faceted snow overlying a crust from earlier in March. This second crust likely doesn’t exist above 2100 m. Strong southwest winds continue to redistribute some of the fresh snow onto lee slopes at the ridgeline.

A layer of facets and surface hoar from mid February can be found down around 90 to 110 cm, and snowpack tests are producing sudden planar results on it.

Another layer of facets and surface hoar from late January can be found down 110 to 150 cm.

Weather Summary

Tuesday Night

Cloudy with 3 to 5 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -4 °C.

Wednesday

Cloudy with isolated flurries 3 to 6 cm. 20 gusting to 60 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1300 m.

Thursday

Mix of sun and cloud. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -7°C. Freezing level 1000 m.

Friday

Mix of sun and cloud with a trace of new snow. 15 km/h southwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded terrain features.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

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.