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Avalanche Forecast

Archived

Mar 2nd, 2025–Mar 3rd, 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

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

Conditions remain primed for human triggering, and a conservative mindset remains critical. Use extra caution around sun-exposed slopes during the heat of the afternoon.

Confidence

Moderate

Avalanche Summary

On Friday, ski cutting resulted in a size 1.5 slab failing on the mid-February weak layer down 70 cm. Several small wet loose avalanches were observed at lower elevations.

On Wednesday and Thursday, the stormy conditions resulted in a widespread natural avalanche cycle up to size 3. Many of these avalanches have been reported as wind, storm and persistent slabs at upper elevations and wet loose at lower elevations.

Conditions remain primed for human triggering on Sunday.

Snowpack Summary

Over the past few days, strong southerly winds and up to 60 cm of new snow hit the region. Wind-transported snow has likely built deeper slabs on northerly aspects at upper elevations. Lower elevation snow may be crusty as freezing levels fall.

The upper metre of the snowpack is complicated. This snow sits above several significant weak layers that formed during the January and February dry spells. These include facets, surface hoar (in sheltered terrain), and crust on solar aspects. These layers are currently reactive.

Deeper in the snowpack, a weak layer of facets and a crust from early December varies in depth from 100 to 300 cm. This layer appears to be dormant but remains an isolated concern in this region.

Weather Summary

Sunday Night

Partly cloudy. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -5 °C.. Freezing level 800 m.

Monday

Mix of sun and clouds. 20 to 30 km/h northeast ridgetop wind. Treeline temperature -5 °C.Freezing level 1100 m.

Tuesday

Mostly sunny. 10 to 20 km/h northeast ridgetop wind. Treeline temperatures -4. Freezing level 900 m.

Wednesday

A mix of sun and cloud. 10 to 25 km/h southeast ridgetop wind. Treeline temperatures -4. Freezing level 900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Conservative terrain selection is critical; choose gentle, low consequence lines.
  • Be mindful that deep instabilities are still present in the snowpack.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

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.