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Avalanche Forecast

Archived

Mar 31st, 2025–Apr 1st, 2025

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, 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.

Very large persistent slab avalanches continue to be reported.

Triggering is most likely on northerly aspects in the alpine.

Confidence

Moderate

Avalanche Summary

On Sunday, a naturally triggered size 2.5 persistent slab was reported on a northerly aspect in the alpine.

Numerous skier and cornice fall triggered storm slabs up to size 2 were reported primarily on northerly aspects in the alpine.

Numerous naturally triggered wet loose avalanches up to size 2 were also reported on solar aspects at treeline and above.

Snowpack Summary

10 to 20 cm of snow overlies a wet, rain-soaked upper snowpack. Expect a surface crust to form at night on most terrain, except possibly on high north alpine slopes.

Recent avalanche activity has involved multiple persistent weak layers. The most common failure layer is the early March surface hoar, facet, and crust layer, buried 70 to 150 cm deep.

Many avalanches have also stepped down to deeper weak layers from February and January, buried 150 to 200 cm deep.

These layers are still adjusting to recent stress and remain a concern for human-triggering and step-down avalanches.

Weather Summary

Monday Night

Mostly cloudy with flurries, 0 to 20 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1100 m.

Tuesday

Mostly cloudy with flurries, 0 to 10 cm snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1700 m.

Wednesday

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1600 m.

Thursday

Mix of sun and cloud. 10 to 20 km/h north ridgetop wind. Treeline temperature -5 °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.
  • Cornice failures could trigger large and destructive avalanches.
  • Triggering deep layers is more likely if the snow surface didn't freeze overnight.
  • Use small, low consequence slopes to test the bond of the new snow.

Problems

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.

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.