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Avalanche Forecast

Archived

Apr 1st, 2025–Apr 2nd, 2025

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

Regions

Banff Yoho Kootenay, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

Cooler temperatures and small amounts of new snow will moderate the avalanche danger on Wednesday and Thursday, then another warm-up comes for the weekend and avalanche danger will rise again. As conditions slowly improve, be careful venturing out into bigger terrain unless it has already avalanched.

Confidence

Moderate

Avalanche Summary

No new activity was reported or observed today, but our observation network is limited today.

Snowpack Summary

Surface crusts on all aspects except north, where good powder snow can be found at treeline and higher. The upper 30 cm of the snowpack contains several crusts, the most prominent being March 27, formed during the rain event last week. Below this, a 70 cm slab of dense snow overlies another 70 cm of weak facets, and test results continue to show weakness and propagation in this layer. This is the main event in the snowpack that should dominate decision-making.

Weather Summary

Unsettled conditions are forecast for Wednesday, bringing isolated flurries with accumulations of 5-10 cm along the divide. An upslope storm will deliver more snow in eastern areas, with K-Country expecting more snow. A ridge of high pressure builds on Thursday, bringing clearing and a drying trend. Another warm-up begins on Friday for the weekend, with freezing levels to 2300 m by Saturday.

Terrain and Travel Advice

  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • Give the new snow several days to settle and stabilize before pushing into bigger terrain.

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.