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Avalanche Forecast

Archived

Apr 3rd, 2025–Apr 4th, 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 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.

Sunny skies will make slopes look inviting, especially on northern aspects where conditions are still good. While north slopes seem appealing this is where the greatest uncertainty lies in triggering the deeper instabilities.

Confidence

Low

Avalanche Summary

One size 1 skier triggered surface slab on Mt. Field headwall. Otherwise, no new activity was reported today,

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 but still show potential for propagation with sudden planar test results.

Weather Summary

Progressively warmer with each day in the outlook.

Friday: Sunny skies, freezing levels climbing to 2100 m, light westerly wind, and alpine temperatures ~3C.

Saturday: Sunny skies and freezing levels climbing to 2300 m, light to moderate westerly wind

Sunday: Sunny and freezing levels climbing to 2500 m, light westerly wind

Monday - cloud and light flurries move back into the region.

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.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.