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Avalanche Forecast

Archived

Mar 12th, 2025–Mar 13th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

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

Touchy storm slabs will exist. Stick with a conservative trip plan and watch for signs of instability.

If the sun is out, natural avalanche activity will spike on solar slopes.

Confidence

Moderate

Avalanche Summary

On Tuesday, several human-triggered slab avalanches up to size 1.5 were reported from the North Shore mountains.

Storm slabs will likely continue to be reactive at treeline and above on Thursday. Expect natural avalanche activity to spike if the sun comes out.

If you are headed to the backcountry, please consider sharing your photos and observations from your day on the Mountain Information Network. Big shout out and gratitude to the folks who have this week. Thank you!

Snowpack Summary

15 to 20 cm of new snow fell 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.

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

Weather Summary

Wednesday Night

Cloudy with clear periods and isolated flurries. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 500 m.

Thursday

Cloudy with some sunny periods and isolated flurries. 15 to 25 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 700 m.

Friday

Cloudy with sunny periods. 10 to 15 km/h southeast ridgetop wind. Treeline temperature -3 °C. Freezing level 900 m.

Saturday

Cloudy with 5 to 10 cm of snow. 15 to 40 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Even brief periods of direct sun could produce natural avalanches.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.