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Avalanche Forecast

Archived

Apr 2nd, 2025–Apr 3rd, 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 avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Little Yoho.

Cooler temperatures, surface crusts and small amounts of new snow will hold down the avalanche danger on Thursday, and natural activity should be limited - caution is still advised in shallow snowpack areas. The avalanche danger will rise again with another warming event and clearing skies on Friday for the weekend.

Confidence

Moderate

Avalanche Summary

No new activity was reported or observed today, but our observation network has been limited the last two days.

Snowpack Summary

Surface crusts on all aspects to ~2800 m except north, where powder snow is found at higher elevations. On southerly aspects, the upper 30 cm contains several crusts. The most prominent crust is Mar 27, formed from rain last week, but we have yet to see avalanches on it.

Below this, 80 cm of firm snow overlies the Jan 30 facets, which are stronger in Little Yoho than further east. The concern remains for shallow snowpack features, where the facets are more pronounced.

Weather Summary

A few flurries Wednesday night with up to 5 cm expected. On Thursday, a ridge of high pressure builds with clearing skies through the day and light northerly winds. Another warm-up begins on Friday for the weekend, with freezing levels climbing to 2300 m by Saturday. Skies will be generally clear on Friday and Saturday. Warmer temperatures and solar input will bump up the hazard on Friday and Saturday.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.

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.