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Avalanche Forecast

Archived

Mar 19th, 2025–Mar 20th, 2025

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 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 unlikely, human triggered possible.

Regions

Little Yoho.

There is uncertainty around how likely it will be to trigger large avalanches on the persistent weak layers in this region.

Conservative decision making is recommended.

Confidence

Moderate

Avalanche Summary

No new natural avalanches observed in Little Yoho on Wednesday, avalanche control on Mount Cathedral (proximate to the region) produced avalanches up to size 3.

A group digging a snowpit in low angle terrain with no overhead exposure on Observation Peak March 18th felt a whumph that remote triggered 5-6 avalanches up to size 2.5 in the cirque around them. This remote trigger with large propagation highlights the dangerous snowpack conditions we are currently in.

Snowpack Summary

At treeline, ~70-100cm of snow overlies the Jan. 30th / Feb. 22nd drought layers. This layer is ~ 20-30 cm of facetted crystals that are weaker than the snowpack above and have been reactive in snowpack tests and with avalanches in the last 10 days. Average snowpack depths at treeline are ~ 200cm.

Expect a surface crust on solar aspects treeline and below.

Weather Summary

Wednesday night: Mainly cloudy with isolated flurries. Alpine temps: Low -8 °C. Mostly light ridge wind occasionally gusting to 35 km/h

Thursday: Cloudy with sunny periods and isolated flurries. Alpine temps: High -4 °C. Ridge wind west: 15 km/h gusting to 50 km/h. Freezing level: 1700 metres

Friday: Flurries. Accumulation: 8 cm. Alpine temps: Low -9 °C, High -5 °C. Ridge wind southwest: 15 km/h gusting to 50 km/h

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.
  • Wind slabs are isolated, but may remain reactive.

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.