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Avalanche Forecast

Archived

Mar 8th, 2020–Mar 9th, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
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.

Great skiing conditions with the recent snow! Watch for storm slab development in steep terrain as the new snow settles, especially in areas with a buried sun crust, and minimize exposure to cornices where possible.

Weather Forecast

A high pressure system will dominate the landscape on Monday with mainly sunny skies for all areas. Alpine winds will be out of the the west at 40-60 km/h. Alpine temperatures stay in the -12 to -15'C range while valley bottoms will warm to near freezing during the afternoon. Winds and temperatures will increase on Tuesday.

Snowpack Summary

5-10cm of snow Saturday night with light winds. Buried wind slabs are present in alpine lee areas. New sun crusts exist on steep solar aspects. 40-50 cm of recent snow over the Feb 29 crust interface on steep solar aspects. The buried Feb 1 crust is present up to 1900m. Generally this area has a deep dense snowpack, with over 300 cm in the alpine.

Avalanche Summary

Avalanche control on Sunday produced limited results with a few avalanches up to size 2.5 and several areas with no results. Cornice control resulted in small storm slabs on the slopes below. Several small natural storm slab avalanches observed in steep terrain. Two skiers triggered a reloaded deep persistent size 1.5 in Lippalian 3 at Lake Louise.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.