Avalanche Forecast

Issued: Jan 20th, 2017 4:05PM

The alpine rating is considerable, the treeline rating is considerable, 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 -7SUNDAY: Cloudy with isolated flurries, wind light south, alpine temperature -8MONDAY: Cloudy with isolated flurries, wind light south, alpine temperature -8More details can be found on the Mountain Weather Forecast.

Avalanche Summary

Avalanche activity has been on a slow decline. Reports from Tuesday and Wednesday indicate several natural and explosives triggered avalanches to size 2.5 and 3. These avalanches were occurring on all aspects in the alpine and tree line and are isolated to the most recent storm snow. There were also reports of several skier and rider triggered avalanches to size 1.5 in both the alpine and tree line. Some of these were remotely triggered from a distance. There was an avalanche involvement in the North Columbia in a low elevation wind loaded pocket releasing on facets down 1m resulting in a full burial. This is definitely something to keep in mind while traveling through open areas below tree line. Click here to see the MIN post.

Snowpack Summary

Recent new snow and moderate to strong southwest winds have developed storm and wind slabs. These have buried a variety of old surfaces including surface hoar, facets, sun crust on steep solar aspects and wind slabs. Below, the mid-December facet/surface hoar persistent weakness can be found buried 70-120 cm deep and is generally considered dormant. However, we are still receiving occasional reports of sudden results in snowpack tests, suggesting that it has to potential to propagate into a large avalanche if triggered. Particularly in shallow spots where this layer is closer to the snow surface. The lower snowpack is well bonded and features a thick rain crust near the ground.

Problems

Storm Slabs

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

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 2

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