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Avalanche Forecast

Archived

Mar 29th, 2021–Mar 30th, 2021

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

Regions

Banff Yoho Kootenay.

Wind and available snow for transport will continue to build wind slabs. Also, there is some uncertainty as to whether storm slabs exist in isolated areas.

Weather Forecast

Sub zero temperatures will persist at valley bottom until Wednesday, it could drop to -20 at the ridge during the same period. Only a few cm's of snow is expected over the next few days. The wind will be strong from the West on Tuesday increasing to extreme late on Wednesday.

Snowpack Summary

15-35cm of settled storm snow at treeline with the higher amounts up 93N. New wind slabs in alpine and exposed treeline areas with strong to extreme S-SW winds. 20-50+ cm now sits over the March 19 interface of crust on solar aspects and facets on north aspects. Nov basal facets still prominent in shallow areas east of the divide.

Avalanche Summary

Sunshine patrol reported observing a natural size 2.5 windslab in Eagle Basin close to the ski area today. A Gaz-Ex controlled wind slab size 2 was triggered last night in the Bourgeau 5 slide path. Otherwise dry loose avalanches were observed that ran in gully features during the storm.

Confidence

Wind speed and direction is uncertain on Tuesday

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.