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Avalanche Forecast

Archived

Mar 10th, 2025–Mar 11th, 2025

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

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. Stick to conservative terrain and watch for signs of instability.

Confidence

Moderate

Avalanche Summary

On Sunday, a widespread natural avalanche cycle occurred up to size 3. Numerous, remote (from afar) human triggered storm slabs (up to size 1.5) were seen on north aspects, and explosives control produced several storm slab avalanches up to size 3.5.

Strom slabs will remain reactive on Tuesday, especially where there is a poor bond to the underlying crust.

Snowpack Summary

Another 10 to 15 cm of new snow is expected by Tuesday afternoon, bringing up to 70 cm of storm snow since the weekend. Strong southwest winds continue to redistribute some of the fresh snow onto lee slopes at the ridgeline. The new snow sits above a crust on all aspects except on high north facing terrain, where new snow buries 5 cm of snow overlying a crust from earlier in March. This second crust likely doesn’t exist above 2100 m.

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

Monday Night

Cloudy with flurries up to 5 cm. 25 to 50 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level valley bottom.

Tuesday

Cloudy with light flurries, 1 to 5 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -2°C. Freezing level 1300 m.

Wednesday

Cloudy with 10 to 15 cm of snow. 20 gusting to 65 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level around 1300 m.

Thursday

Mix of sun and cloud with light flurries. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up at lower elevations. Storms slabs have been reactive at all elevations.
  • Avoid freshly wind-loaded terrain features.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

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.