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Avalanche Forecast

Archived

Mar 9th, 2025–Mar 10th, 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, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Northwest Coastal, Northwest Inland, Boundary, Stewart, Kispiox, Ningunsaw, Ningunsaw, Ningunsaw.

Look for signs of instability and assess the bond between new snow and the old surface as you move through terrain.

Be ready to back off if there's a weak bond between new snow and the old surface. 

Confidence

Moderate

Avalanche Summary

There have been several reports of windslab avalanches up to size 2 at treeline and alpine elevations.

Persistent slab avalanches on the February weak layer have tapered off since earlier this week.

Snowpack Summary

20 cm of new snow is being redistributed by southerly winds. This new snow fell on a widespread layer of large surface hoar crystals, which sits on a crust on solar aspects and at low elevations. This should produce reactive or even touchy surface instabilities.

A layer of facets, surface hoar and/or a crust from mid-February are buried 50 to 100 cm deep. This layer produced large natural and human-triggered avalanches earlier this week.

The remainder of the snowpack is well consolidated with no concerns at this time.

Weather Summary

Sunday Night

Mostly cloudy with 1 to 3 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -6 °C.

Monday

Cloudy with 5 cm of snow. 30 to 40 km/h southeast ridgetop wind. Treeline temperature -6 °C.

Tuesday

Cloudy with 0 to 3 cm of snow. 10 to 20 km/h south ridgetop wind. Treeline temperatures -7 °C. Freezing level 700 m.

Wednesday

Cloudy with flurries. 30 - 40 km/h south ridgetop wind. Treeline temperature -7 °C. Freezing level 700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for larger than expected storm slabs due to buried surface hoar.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Be mindful that deep instabilities are still present and have produced recent 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.