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Avalanche Forecast

Archived

Apr 20th, 2025–Apr 21st, 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

Kitimat, Nass, Rupert, Seven Sisters, Shames, Howson.

Recently formed wind slabs may be reactive to human triggering.

Data is very sparse this time of year. During periods of uncertainty, a cautious approach is always recommended.

Confidence

Low

Avalanche Summary

No new avalanches have been reported recently, but observations have been very limited in this region.

Snowpack Summary

A widespread surface crust is expected to have formed after Thursday's warming event. The new snowfall from Friday and Saturday is expected to have been redistributed by moderate winds in wind-exposed terrain.

There are three notable weak layers from February and March in the middle of the snowpack. These layers have recently gone dormant and are not expected to pose a hazard under the current conditions.

Weather Summary

Sunday Night

Mostly cloudy. 20 to 30 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 900 m.

Monday

Cloudy. 20 to 30 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

Tuesday

Cloudy. 15 to 25 km/h northwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Wednesday

Cloudy with snowfall 3-5 cm. 20 to 30 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.