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Avalanche Forecast

Archived

Apr 6th, 2025–Apr 7th, 2025

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

Regions

Sea To Sky, Brandywine, Garibaldi, Homathko, Spearhead, Tantalus.

Forecast snow and wind will form storm slabs most reactive to human triggers in wind affected terrain at upper elevations.

Make conservative terrain choices and avoid overhead hazard.

Confidence

Moderate

Avalanche Summary

On Saturday, numerous naturally triggered size 1 wet loose avalanches were reported on solar aspects.

Forecast snow and wind are expected to form reactive storm slabs.

Snowpack Summary

Forecast 15 to 25 cm of snow (above 1200 m, rain below) on Sunday night will form fresh storm slabs. They will be sitting on either moist snow or a crust everywhere except north facing slopes in the alpine where they will overlie a mix of dry snow and surface hoar.

The storm slabs are expected to be most reactive in wind affected terrain at upper elevations.

Old persistent weak layers may still exist 1 to 3 m deep on high north-facing slopes.

The snowpack thins quickly at lower elevations.

Weather Summary

Sunday Night

Snow, 15 to 25 cm above 1200 m, rain below. 20 to 30 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1600 m.

Monday

Mostly cloudy with flurries, 5 to 15 cm of snow above 1000 m. 20 to 30 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Tuesday

Cloudy with flurries, 5 to 15 cm snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Wednesday

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 5 to 10 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Avoid travelling on slopes below cornices.

Problems

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.

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.