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Avalanche Forecast

Archived

Feb 26th, 2021–Feb 27th, 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.

Quite a bit of new snow has fallen at the upper elevations over the past week and at times this has been accompanied by strong winds. Use caution in steeper or larger terrain features and expect sluffing in steep terrain.

Weather Forecast

Alpine winds will start off light on Saturday and start rising later in the afternoon into the moderate range as they shift to the NW. Temperatures will remain cool with treeline values between -10 to -15 Celsius. A few flurries are expected but no significant accumulations, and there may be some sunny breaks in the afternoon.

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

Ski hills reported some small wind slabs up to size 1.5 in lee areas of the alpine with ski cutting and explosives. No new slab avalanches have been reported or observed in the Yoho area for a couple days but sluffing up to size 1.5 in the new snow was reported on Friday. Some whumpfing was reported Thursday on a steep S aspect at treeline.

Confidence

Due to the number of field observations

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.