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Avalanche Forecast

Archived

Nov 24th, 2024–Nov 25th, 2024

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

Northwest Coastal, Boundary, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Ningunsaw, Ningunsaw, Ningunsaw.

Avalanches are becoming harder to trigger but are most likely to fail on steep, wind-loaded slopes, particularly near ridgetops.

Confidence

Moderate

Avalanche Summary

Sunday: A few small natural and explosive-triggered wind slabs occurred north of Stewart. Saturday: In the same area, one small and one large (size 2) naturally triggered avalanche were observed.

These wind slabs should quickly become less reactive to human-triggering as time passes.

Early season reports have been extremely limited, especially in areas near Terrace. Please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

Strong easterly winds formed slabs on many lee slopes. The greatest uncertainty lies in how long these slabs will take to bond.

Expect to find sastrugi and hard wind-scoured surfaces in most open wind-exposed areas at upper elevations.

New surface hoar and facets are growing on the snow surface in wind-sheltered locations.A rain crust from early November is buried 50 to 100 cm deep in the alpine. In isolated, sheltered areas, a layer of surface hoar may be found 60 cm+ deep.Snow depths vary across the region, but generally range from 100 to 200 cm in the alpine and about 50 cm at 1000 m.

Weather Summary

Sunday Night

Mostly clear. 20 to 30 km/h east wind. Treeline temperature -12 °C.

Monday

Mostly sunny. 15 to 20 km/h variable wind. Treeline temperature -9 °C

Tuesday

A mix of sun and cloud. 30 to 40 km/h west wind. Treeline temperature -8 °C.

Wednesday

Cloudy with 1 to 7 cm of new snow. 40 to 50 km/h west wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for areas of hard wind slab on alpine features.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.

Problems

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.