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Avalanche Forecast

Archived

Apr 9th, 2025–Apr 10th, 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 possible, human triggered probable.
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.

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.

Rising freezing levels and brief periods of sun could trigger wet loose avalanches.

Confidence

Moderate

Avalanche Summary

On Tuesday, a large natural glide slab release (size 2.5) from a south aspect at 2100 m. Numerous human triggered wind slabs, storm slabs and wet loose avalanches were seen (up to size 1.5) on all aspects above 2000 m.

Wind slabs and storm slabs may continue to be reactive to human triggering on Thursday, especially in the alpine on north through east slopes. Wet loose avalanches may be seen with rising freezing levels.

Snowpack Summary

15 to 35 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 but will likely soften with rising freezing levels.

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

Wednesday Night

Mostly clear with some cloud. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level falling to 1300 m.

Thursday

Cloudy with snow starting in the afternoon up to 10 cm. 50 to 70 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2500 m. Freezing level dropping to 1200 m overnight.

Friday

Cloudy with flurries 5 to 15 cm. 25 to 45 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1800 m.

Saturday

Mix of sun and cloud with isolated flurries up to 10 cm. 15 gusting to 45 km/h northwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.

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.