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Avalanche Forecast

Archived

Mar 3rd, 2025–Mar 4th, 2025

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.
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.

There have been several large avalanches reported throughout the region.

Conditions remain primed for human triggering and a conservative mindset remains critical.

Confidence

Moderate

Avalanche Summary

On Sunday, several avalanches up to size 3 were reported throughout the region.

Many of these avalanches were triggered by cornices falling and initiating avalanches on layers deeper in the snowpack. Expect cornices to remain reactive with warm, sunny weather.

Snowpack Summary

Wind-transported snow has likely built deeper slabs on northerly aspects at upper elevations. South-facing slopes have formed a crust and 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

Monday Night

Partly cloudy. 20 to 30 km/h east ridgetop wind. Treeline temperature -6 °C. Freezing level 800 m.

Tuesday

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

Wednesday

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

Thursday

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

  • Be mindful that deep instabilities are still present in the snowpack.
  • Conservative terrain selection is critical; choose gentle, low consequence lines.
  • 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.