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Avalanche Forecast

Archived

Mar 21st, 2025–Mar 22nd, 2025

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
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.

New snow and strong southerly winds have created reactive storm slabs.

Choosing conservative terrain is essential during this period of stormy weather.

Confidence

Moderate

Avalanche Summary

Several natural persistent slab avalanches up to size 3 were reported on Thursday, failing on the mid-March or early March surface hoar layers.

Snowpack Summary

20-50 cm of recent snow has accumulated over previously wind-affected surfaces and crusts on steep south-facing terrain.

Three layers of concern currently exist in the upper-mid snowpack. Surface hoar that formed in mid-March can be found 65 to 85 cm below the snow surface. Below this, another layer of surface hoar that formed in early March can be found at a depth of 90 to 125 cm. Additionally, a layer of facets, surface hoar, and/or a crust from mid-February is buried 80 to 180 cm deep.

The remainder of the snowpack is well consolidated, and there are no current concerns.

Weather Summary

Friday Night

Mostly cloudy with 0 to 2 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -6 °C.

Saturday

Cloudy with 5 to 10 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -5 °C.

Sunday

Cloudy with up to 5 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

Cloudy with flurries. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C as freezing levels rise to 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.

Problems

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.

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.