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Avalanche Forecast

Archived

Feb 27th, 2021–Feb 28th, 2021

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

Regions

Little Yoho.

Increased wind will create fresh wind slabs on Sunday. Also, be on the look out for wind slabs that are buried.

Weather Forecast

Sunday will see a slight warming trend. Small amounts of snow are expected. Wind is expected to pick up into the strong range from the W-SW for Sun and Mon. All of these weather factors will increase wind slab development.

Snowpack Summary

Over a meter of new snow has fallen at treeline in the Little Yoho region over the last week with recent winds creating wind slabs in alpine and exposed treeline lee areas. The new snow has settled into 50-80 cm of storm snow over the Feb 19 interface and seems to be bonding well in most places. Surface snow is sluffing easily in steep terrain.

Avalanche Summary

Lake Louise ski patrol triggered a size 2 wind slab avalanche that stepped down to the Jan 27 facet layer which produced a fracture line that was 80 to 120cm deep. Also, at Serac in Kootenay, an ACMG guide reported a size 2.5 loose dry avalanche triggered by a cornice. Limited details, but it reportedly kicked up a substantial powder cloud.

Confidence

Wind speed and direction 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 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.