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Avalanche Forecast

Archived

Apr 6th, 2025–Apr 7th, 2025

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Forecast snow and southerly wind may form fresh wind slabs at upper elevations.

Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Confidence

Moderate

Avalanche Summary

On Saturday, a skier triggered a size 1 wind slab on a north aspect in the alpine. Numerous naturally triggered size 1 wet loose avalanches were also reported on solar aspects.

NOTE: Observations are currently very limited in this region.

Snowpack Summary

Forecast snow and southerly wind may form fresh wind slabs at upper elevations.

These slabs will overlie mostly crusty surfaces other than northerly aspects in the alpine where the snow surface remained dry.

Persistent weak layers from January, February, and March are buried 50 to 150 cm deep across the region, though their current reactivity remains uncertain.

At lower elevations, the rain-saturated snowpack thins quickly with elevation.

Weather Summary

Sunday Night

Mostly cloudy with flurries, 5 to 15 cm snow above 1500 m, rain below. 10 to 20 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 m.

Monday

Mostly cloudy with isolated flurries, 3 to 10 cm snow. 10 to 20 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1800 m.

Tuesday

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 10 to 20 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1700 m.

Wednesday

Mostly cloudy with isolated flurries, 0 to 3 cm snow. 10 to 20 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1600 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.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Cornice failures could trigger large and destructive avalanches.

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.

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.