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Avalanche Forecast

Archived

Feb 28th, 2021–Mar 1st, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

More snow and wind will continue to create wind slabs at upper elevations.

Weather Forecast

Strong to extreme Westerly winds at mountain top will begin to dissipated late Tuesday. A short pulse of precipitation is forecasted late Monday, with accumulation amounts of 5-20cm of snow. Freezing levels with remain at valley bottom with temperatures ranging from -5 to -10.

Snowpack Summary

Over a meter of new snow has fallen at tree line 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

Report of a skier triggered cornice on Emerald Peak initiated a size 2 avalanche Sunday. This is the second report of a cornice release in this region over the weekend.

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.