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Avalanche Forecast

Archived

Mar 7th, 2021–Mar 8th, 2021

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

Regions

Little Yoho.

A good freeze Sunday has settled things down at lower elevations following last week's warm up but watch for a strong solar punch on Monday.

Weather Forecast

SW winds 35-45km/h midday Sunday should diminish by noon Monday as a ridge forms over the Rockies. Trace amounts of snowfall from convective activity can be expected overnight but skies will clear as the ridge builds. Expect freezing levels to reach 1500m but, as the sun comes out, and winds diminish, expect strong solar heating in the afternoon.

Snowpack Summary

10-15 cm of new snow sits over a crust on solar aspects. Moderate SW winds are transporting this new snow at treeline ridge crests and above. Facets are present down 70-100 cm but we are getting minimal to no results in snowpack tests and not seeing avalanche activity on these layers like we are in the Banff and Kootenay regions.

Avalanche Summary

Small loose wet sluffs were observed on steep solar aspects Saturday when the sun came out. Freezing levels only reach 1500m Sunday with cloud. The ski hills reported working with only small, fresh wind slabs. Natural cornice, explosive, and some skier triggered avalanches, up to size 3, have been observed in the past week during the big warm up.

Confidence

Intensity of incoming weather systems is uncertain on Monday

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.