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Avalanche Forecast

Archived

Mar 3rd, 2026–Mar 4th, 2026

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

Regions

Little Yoho, Kootenay.

More snow is on the way! Watch for new storm slab development as snow accumulates. This new snow will add more load to the persistent problem, which may initiate more natural avalanche activity on this interface.

Confidence

Avalanche Summary

No field teams were down in Yoho or Kootenay on Tuesday, so there are no new observations to report.

Monday's MIN reports showed more of the aftermath of last week's storm.

As another system moves into the region, we expect to see more avalanche activity on the persistent avalanche problem.

Snowpack Summary

New storm snow overlies a heavily wind-affected surface at upper elevations. Below this, the Jan. 24 layer (surface hoar/crust/facet) sits 30–50+ cm down at treeline. This layer has been very reactive in Kootenay and Yoho. In the alpine, we suspect this problem is predominantly on southerly aspects as a facet/crust interface. We expect touchy conditions for the foreseeable future.

Weather Summary

A westerly system will move into the region Tuesday night through Wednesday. As this moist air mass approaches, winds will begin to taper, with ridge-top speeds near 30 km/h from the west.

Precipitation amounts will vary from north to south, with northern regions expecting 20–35 cm by Friday afternoon and significantly lower totals in the south. Freezing levels will rise to around 2,000 meters on Wednesday.

Terrain and Travel Advice

  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.

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.