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Avalanche Forecast

Archived

Apr 1st, 2025–Apr 2nd, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
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.
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.

Large persistent slab avalanches continue to be reported, primarily on northerly aspects in the alpine.

Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.

Confidence

Moderate

Avalanche Summary

On Monday, a helicopter remotely triggered a size 2 deep persistent slab on a very steep and rocky northeast aspect in the alpine.

A couple natural and skier triggered wind slabs were reported on northerly aspects in the alpine.

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

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.

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

These layers remain a concern for human-triggering and step-down avalanches.

Weather Summary

Tuesday Night

Mostly cloudy with flurries, 0 to 15 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -5 °C. Freezing level 800 m.

Wednesday

Mostly cloudy with flurries, 0 to 10 cm snow above 1300 m, rain below. 10 to 20 km/h west ridgetop wind. Treeline temperature -3 °C. Freezing level 1700 m.

Thursday

Mostly sunny. 10 to 20 km/h north ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

Friday

Sunny. 5 to 10 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Cornice failures could trigger large and destructive avalanches.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • 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.