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Avalanche Forecast

Archived

Apr 12th, 2025–Apr 13th, 2025

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

Regions

Little Yoho.

Sunday could prove to be a great day for skiing!

Beware of the potential for surface avalanches to step down to deeper layers.

Confidence

High

Avalanche Summary

No new avalanches observed or reported Saturday.

On Friday, a remote wind slab avalanche on St. Nicholas size 2.5 was reported that stepped down to deeper layers and occurred out of steep unsupported terrain

Snowpack Summary

10-40cm of new snow overlays a surface crusts found in most locations except north-facing alpine zones. Windslab can be found on lee aspects. The integrity of the snowpack related to human triggering is based upon the strength and supportiveness of the surface crust. In areas with no recent surface crust, where the snow is dry and the ski conditions are best, the snowpack is generally strong, but a mid-pack layer of facets (Jan 30) remains the main buried weak layer of concern

Weather Summary

Saturday night: Clear periods with isolated flurries. Alpine temps: Low -10 °C. Ridge wind northwest: 10-30 km/h.

Sunday: Sunny with cloudy periods. Precipitation: Nil. Alpine temps: High -5 °C. Ridge wind west: 10-30 km/h. Freezing level: 1800 metres.

Monday: A mix of sun and cloud. Alpine temps: Low -6 °C, High 1 °C. Mostly light ridge wind occasionally gusting to 40 km/h. Freezing level: 2400 metres.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

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.