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Avalanche Forecast

Archived

Apr 2nd, 2022–Apr 3rd, 2022

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

Regions

Banff Yoho Kootenay.

A low will start to influence the area with light precipitation Sunday afternoon that will build into heavier accumulations Monday.

The potential for a poor freeze, and possibly rain, may lead to a deterioration in the crusts BTL and maybe TL Monday. 

Weather Forecast

A good freeze can be expected Sun AM under a brief ridge before a low pushes in through the afternoon. Trace amounts of snow above about 1800m. A weaker freeze Mon AM as the low reaches the Rockies with 2-5cm of snow overnight. SW winds will increase to moderate/strong with another 5-10 cm above 1900m. Rain is possible at lower elevations.

Snowpack Summary

Trace amounts of new snow over surface melt-freeze crusts that can be found on all aspects up to approx. 2300m and higher on solar aspects. On high elevation north aspects, deeper dry snow persists with isolated thin wind slabs in the alpine. The mid-pack is well settled but has several persistent layers consisting of crusts and/or facets.

Avalanche Summary

Mistaya Lodge reported a sz 1.5 slab on a glacial ice feature, NE aspect , 30-40cm deep, that failed naturally within recent storm snow accumulations.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

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 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.