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Avalanche Forecast

Archived

Apr 8th, 2025–Apr 9th, 2025

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

Regions

North Columbia, South Columbia, Esplanade, Jordan, North Monashee, North Selkirk, Badshot-Battle, Central Selkirk, Goat, Gold, Retallack, Valhalla, Whatshan.

Storm slabs at upper elevations may be reactive to rider triggering.

Even brief periods of sunshine will affect the new snow and trigger wet loose avalanches on steep slopes facing the sun.

Confidence

Moderate

Avalanche Summary

On Monday, natural wet loose avalanches up to size 2 were reported. Rider-triggered wind slabs were also reactive on north aspects in the alpine up to size 1.

Large natural cornice failures may occur if its sunny during the heat of the day. These act as a large trigger on slopes below and could trigger deeper persistent weak layers initiating very large avalanches.

Snowpack Summary

15 to 30 cm of new snow exists at treeline and above. High north-facing slopes will see deeper accumulations due to wind transport. A surface crust has formed at treeline and below, but will likely soften with daytime warming at lower elevations and up into the alpine on slopes facing the sun.

Below this, a 5 to 25 cm crust from the late March rain event is present. The new snow may have a poor bond to the underlying crust. This buried crust is capping a moist upper snowpack.

The primary weak layer of concern was buried in early March, consisting of surface hoar, facets, and a crust is now 80 to 150 cm deep.

Deeper weak layers from February and January are buried 150 to 200 cm deep.

Weather Summary

Tuesday Night

Cloudy with snow 10 to 20 cm. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level falling to 1400 m.

Wednesday

Mix of sun and cloud with isolated flurries. 20 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1800 m.

Thursday

Cloudy with flurries 5 to 15 cm. 25 to 45 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 2200 m.

Friday

Mix of sun and cloud with isolated flurries. 15 gusting to 45 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 2200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Expect slab conditions to change drastically as you move into wind-exposed terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Cornice failures could trigger large and destructive avalanches.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.