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Avalanche Forecast

Archived

Apr 10th, 2025–Apr 11th, 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 possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

Little Yoho.

The snowpack in Little Yoho is significantly better than the shallower snowpack areas to the east. Less solar input is expected Friday, but watch locally for its effects.

A weaker freeze is expected below treeline to start the day.

Confidence

Moderate

Avalanche Summary

No new avalanches were observed on Thursday.

Snowpack Summary

Surface crusts are found in most locations except north-facing alpine zones. The integrity of the snowpack is based mostly upon the strength of the surface crust when it refreezes overnight (or doesn't). In areas with no 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

3-5cm of snow is expected Thursday night into Friday AM with strong SW winds, diminishing over the day. Freezing levels are expected to rise to 2000m with mainly cloudy skies. See table for more details.

Terrain and Travel Advice

  • Start your day early and be out of avalanche terrain during the heat of the day.

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.

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.