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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

Sea To Sky, Brandywine, Garibaldi, Homathko, Spearhead, Tantalus.

Human triggered avalanches are likely, use extra caution on lee slopes at ridgeline.

Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential.

Confidence

Moderate

Avalanche Summary

No new reports by Tuesday afternoon. 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 120 cm of settling storm snow sits above a crust on all aspects except high north facing slopes, where it sits on faceted snow that formed early March. Strong southwest winds have redistributed storm snow into toucy slabs on leeward slopes at the ridgeline. Below treeline the storm snow is settling out rapidly.

A layer of facets and surface hoar from mid February can be found down 100 to 140 cm.

Another layer of facets and surface hoar from late January can be found down 140 to 200 cm.

Weather Summary

Tuesday Night

Cloudy with 5 to 8 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -4 °C. Freezing level 900 m.

Wednesday

Cloudy with isolated flurries. 20 gusting to 70 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1300 m.

Thursday

Mix of sun and cloud. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -2°C. Freezing level 1000 m.

Friday

Mix of sun and cloud with a trace of new snow. 20 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid lee and cross-loaded slopes at alpine and treeline elevations.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Storm slabs in motion may step down to deeply buried weak layers and result in very 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.