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Avalanche Forecast

Archived

Mar 7th, 2025–Mar 8th, 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 and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
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 unlikely, human triggered possible.

Regions

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

New snow and moderate winds are expected to build fresh storm slabs throughout the day on Saturday.

Storm slabs could step down to deeper layers, creating larger than expected avalanches.

Confidence

Moderate

Avalanche Summary

No new avalanches were reported on Friday by 4 pm.

As storm snow accumulates on Saturday, we anticipate an increase in avalanche activity throughout the day as storm slabs grow deeper and become more reactive.

Snowpack Summary

By Saturday morning, 5 to 10 cm of storm snow has accumulated, and an additional 10 to 25 cm of snow is expected through the day. Storm snow covers 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 40 cm.

Another layer of facets and surface hoar from late January can be found down 60 to 80 cm.

The lower snowpack contain several crusts that are not concerning.

Weather Summary

Friday Night

Cloudy with flurries, 5 to 10 cm of snow. 25 to 35 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1000 m.

Saturday

Cloudy with flurries, 10 to 25 cm of snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -4 °C. Freezing level rises to 1300 m.

Flurries will continue overnight, up to 30 cm of snow.

Sunday

Cloudy with flurries, 5 to 15 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level around 1500 m.

Monday

A mix of sun and cloud. 10 to 25 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level around 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Dial back your terrain choices if you are seeing more than 25 cm of new snow.
  • Avoid freshly wind-loaded terrain features.
  • Storm slabs in motion may step down to deeper layers resulting in large 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.