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Avalanche Forecast

Archived

Apr 7th, 2025–Apr 8th, 2025

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

Regions

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

Snowfall amounts are uncertain, and higher amounts are possible south of Highway 1 (TCH).

If you see more than 25 cm of new snow overnight, consider the avalanche danger to be HIGH.

Confidence

Moderate

Avalanche Summary

Reactive storm slabs are likely on Tuesday at upper elevations.

On Sunday, continued natural wet slabs, glide slabs, wet loose and cornice failures up to size 2.5 were reported. Rider-triggered wind slabs were also reactive on north aspects in the alpine up to size 1.

Large natural cornice failures continue to be reported and are a prime suspect for triggering persistent slab avalanches.

Snowpack Summary

By Tuesday morning, 15 to 30 cm of new snow may fall at treeline and above. High north aspects will see the deeper accumulations. Solar aspects and lower elevations on all aspects will present as moist snow, especially when the sun comes out.

Below this, a 5 to 25 cm crust from the late March rain event is present. This 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

Monday Night

Cloudy with snow 10 to 25 cm. 25 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level falling to 1200 m.

Tuesday

Cloudy with sunny periods and snow 5 to 10 cm. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1800 m.

Wednesday

Cloudy with flurries 2 to 8 cm. 15 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1700 m.

Thursday

Mix of sun and cloud. 15 to 25 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2500 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.

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.