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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 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.

Regions

South Coast, Powell River, North Shore, Sasquatch, Sasquatch, Sky Pilot, Tetrahedron, Harrison-Fraser.

15 to 30 cm of new snow and strong southwest wind will build touchy storm slabs Wednesday. Avoid lee slopes at ridgeline.

Stick with a conservative trip plan and watch for signs of instability

Confidence

Moderate

Avalanche Summary

No new reports by Tuesday afternoon. On Monday, evidence of a widespread slab avalanche cycle up to size 2.5 trickles in.

With forecasted new snow and wind, storm slabs will likely be reactive on Wednesday.

If you are headed to the backcountry, please consider sharing your photos and observations from your day on the Mountain Information Network.

Snowpack Summary

20 to 40 cm of new snow is forecast by Wednesday afternoon. This could bring storm snow totals in the alpine to over 100 cm since the weekend. High north-facing slopes may see deeper deposits of wind-transported snow.

At treeline and below, the new snow will sit above a crust on all aspects. This crust has approximately 30 cm of dense, saturated storm snow below, with the upper snowpack generally seeing moist throughout.

The mid and lower snowpack contain several crusts that are not concerning.

Check out this great MIN with snowpack observations from the Mount Seymour area.

Weather Summary

Tuesday Night

Cloudy with 10 to 20 cm of snow. 15 to 40 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 800 m.

Wednesday

Cloudy with 10 to 20 cm of snow. 10 gusting to 60 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 900 m.

Thursday

Mix of sun and cloud. 20 to 25 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 600 m.

Friday

Mix of sun and cloud with a trace of new snow. 10 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Avoid freshly wind-loaded terrain features.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • 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.