Avalanche Forecast

Issued: Jan 20th, 2017 4:06PM

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

Avalanche Canada mbender, Avalanche Canada

Continued unsettled weather with a gradual cooling. The snowpack will take a few days to adjust to its new load. In the meantime a cautious approach is recommended.

Summary

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

SATURDAY: Mix of sun and cloud, wind light southeast, alpine temperature -4SUNDAY: Cloudy with isolated flurries, wind light to moderate southeast, alpine temperature -5MONDAY: Cloudy with isolated flurries, wind light west, alpine temperature -6More details can be found on the Mountain Weather Forecast.

Avalanche Summary

Avalanche activity has been on a slow decline since the recent storm. Reports from Tuesday and Wednesday show several natural avalanches to size 2.5 and 3. These avalanches were occurring on all aspects in the alpine and are isolated to the most recent storm snow. There were also a few skier controlled avalanches to size 2 releasing as a storm slab in the upper tree line elevation band. Earlier in the week a person walking at 600 metres elevation triggered a wind slab avalanche 100 cm deep running on a facet layer. It was 20 metres wide on a smooth north aspect that released a size 2.0 avalanche burying one person with just their hand exposed. The person was rescued by their companion. Click here to see the MIN post.

Snowpack Summary

The most recent new snow and southwest wind have formed storm and wind slabs that are sitting on a variety old surfaces that include facets, surface hoar and hard wind slabs. The newly buried surface hoar was reported to be up to 10mm in size in protected areas. A layer of sugary faceted snow and spotty surface hoar which formed during mid December's cold snap now lies 100-120cm below the surface. This layer is now dormant in many areas, but may still be a concern in shallow snowpack parts of the region, particularly around Clemina Creek. It is highly recommended to investigate this layer before committing to any large, unsupported features. The lower snowpack seems to be generally strong and well settled.

Problems

Storm Slabs

An icon showing Storm Slabs
Storm snow combined with strong southwest winds and warming temperatures have developed new wind and storm slabs
New snow will require several days to settle and stabilize.Watch for signs of instability such as whumpfing, or cracking. Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Jan 21st, 2017 2:00PM

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