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Avalanche Forecast

Archived

Mar 25th, 2021–Mar 26th, 2021

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

Regions

Little Yoho.

Expect to see wind slab development as winds increase on Friday. Loose dry sluffs are a major concern for those venturing into steep confined terrain features.

Excellent snow quality exists at tree line and above.

Weather Forecast

Mainly cloudy skies on Friday with isolated flurries accumulating 1-2cm of snow. The freezing level will be around 1600m as the valley bottom high will reach +3. Winds will range from 20-50km/hr from the SW. Additional snow and increasing winds are forecasted for the weekend.

Snowpack Summary

15-40 cm of snow has fallen within the last week with variable SW-NW winds. This new snow sits over a sun crust (up to ridge tops) on solar aspects, over a temperature crust at lower elevations and over a mix of surfaces on North aspects including facets and spotty surface hoar. Thin snowpack areas are becoming isothermal below treeline.

Avalanche Summary

No new natural avalanche activity observed or reported today other than some small loose dry sluffs out of steep alpine terrain.

Local ski areas were able to explosively trigger cornices up to sz 1.5, which pulled small pockets of wind slab on the slopes below.

Confidence

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.