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Avalanche Forecast

Archived

Mar 29th, 2025–Mar 30th, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Microwave-Sinclair, North Bulkley, South Bulkley, South Bulkley, South Bulkley, Telkwa.

Where a supportive crust exists, avalanches are unlikely.

Investigate alpine terrain for heightened avalanche hazard due to buried weak layers.

Confidence

Moderate

Avalanche Summary

Where a thick, supportive surface crust is found, we expect that triggering avalanches on buried weak layers is unlikely.

Size 2 to 3 persistent slab avalanches were last reported on Monday. There have been limited other reports through the week.

Snowpack Summary

Wind has modified surfaces and formed slabs in lee features. A crust is found up to 1500 m on all aspects and higher on solar slopes.

A layer of surface hoar is now buried 30 to 60 cm deep, it persists at alpine elevations and on 'polar aspects' (slopes protected from the sun).

Another layer of facets, surface hoar and/or a crust buried in mid-February is 60 to 100 cm below the snow surface and has been reactive in snowpack tests.

Deeper in the snowpack, a weak layer of facets and a crust from early December can be found. This layer appears to be dormant but is still worth keeping in mind in thin snowpack areas in the alpine.

Weather Summary

Saturday Night

Mostly clear. 10 to 30 km/h south ridgetop wind. Treeline temperature -12 °C.

Sunday

Partly cloudy. 20 to 40 km/h southeast ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Monday

Mostly sunny. 20 km/h south ridgetop wind. Treeline temperature +1 °C. Freezing level 1700 m.

Tuesday

Cloudy with snow showers, light accumulations. 25 to 40 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Avoid shallow snowpack areas, rocky outcrops, and steep terrain where triggering is most likely.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.