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Avalanche Forecast

Archived

Mar 6th, 2025–Mar 7th, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

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

Avoid large, steep features where triggering the persistent problem is still a concern.

Patience and conservative terrain choices are recommended.

Confidence

Moderate

Avalanche Summary

On Wednesday, south of Revelstoke there was a large (size 3) natural persistent slab avalanche on a south aspect at 2500 m. It's suspected to have failed on the late January weak layer.

There were also a few large (size 2) natural and rider-triggered storm slabs that were 20 to 30 cm deep. As well as many small (size 1-1.5) dry loose avalanches, both natural and rider-triggered.

Snowpack Summary

10 to 15 cm of new snow sits on a 3 to 5 cm thick melt-freeze crust that is everywhere except north facing slopes above 2000 m.

A weak layer, composed of facets, surface hoar, or a crust, is found 20 to 60 cm deep. Another persistent weak layer, buried in late January, lies 50 to 110 cm deep. This layer is surface hoar, facets, or a crust, depending on the aspect.

The remaining snowpack is well-settled and strong.

Weather Summary

Thursday Night

Mostly clear skies. 20 to 30 km/h west ridgetop wind. Treeline temperature -8 °C.

Friday

Mix of sun and clouds. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1800 m.

Saturday

Cloudy with 10 to 20 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1600 m.

Sunday

Cloudy with 20 to 40 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Be mindful that deep instabilities are still present in the snowpack.
  • Uncertainty is best managed through conservative terrain choices.

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.