Avalanche Forecast

Issued: Jan 24th, 2016 8:12AM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada bcorrigan, Avalanche Canada

Use caution venturing into new terrain, especially in wind affected areas.

Summary

Confidence

Moderate - Due to the number and quality of field observations

Weather Forecast

Partly cloudy with sunny periods through the forecast period as the South Rockies comes under the effects of a high pressure ridge centered over the interior of BC.  Light flurries possible, but no significant precipitation in the forecast for the next three or four days. Freezing levels will be at valley bottom overnight and rising above 1000 metres during the day.

Avalanche Summary

Reports from the western part of the region tell of numerous large natural avalanches as well as a size 1, loose-wet avalanche below tree line. Operators are  reporting impressive results with explosives, up to size 3.  South West winds continue to transport the snow at tree line and above into touchy wind slabs.

Snowpack Summary

Recent storms with strong southwest winds have redistributed the snow at tree line and above. Wind slabs have formed lee on slopes. Operators have reported moist-wet snow below 1600 metres. East of Crowsnest Pass, new snow overlies scoured surfaces or hard stubborn wind slabs from last week. In general, the mid and lower snowpack are strong and well-settled in these areas. West of the divide there's a mix of weak crystals around 30 to 50cm below the surface. This layer is a combination of surface hoar, facets and a hard crust that formed on steep solar aspects. Additional snow load will add to the size and reactivity of a developing persistent slab. About 60 to 80cm below the surface you may also find a surface hoar layer which formed in December. Although no avalanches have been reported on this layer, it continues to produce sudden planar results in snowpack tests and could come into play with a large trigger such as a cornice, or simply additional storm loading.All areas have received extensive wind activity.

Problems

Wind Slabs

An icon showing Wind Slabs
South West winds continue to redistribute new snow into touchy wind slabs
Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Be aware of the potential for wide propagations due to the presence of hard windslabs.>

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 3

Persistent Slabs

An icon showing Persistent Slabs
The persistent weak layer might be triggered by a small or medium sized rider-triggered avalanche
Use extra caution on open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Jan 25th, 2016 2:00PM

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