Avalanche Forecast

Issued: Feb 12th, 2016 8:23AM

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 ccampbell, Avalanche Canada

Avalanche conditions could vary dramatically between aspects and elevations. Triggering large avalanches is still possible. Remain diligent and continue to make conservative decisions.

Summary

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Saturday

Weather Forecast

SATURDAY: Mainly cloudy with continued light snowfall bringing another 1-3cm of accumulation. Freezing levels around 1300m and winds are expected to be moderate from the west. SUNDAY: Another 5cm possible overnight before continued light snowfall brings1-3cm of accumulation throughout the day. Freezing levels rising throughout the day to as high as 1500m and continued moderate westerly winds. MONDAY: Light to moderate snow with freeing levels around 1800m.

Avalanche Summary

A natural Size 1.5 avalanche was observed in the Kicking Horse slackcountry on Thursday that apparently ran on a reloaded bed surface in a wind loaded feature. The interface is suspected to be the early January weak layer. Natural persistent slab avalanche activity was also observed earlier in the week, with a report of two Size 2.5s also in the Kicking Horse backcountry, that also released on the surface hoar, facet and crust weakness as deep as a meter down.

Snowpack Summary

A supportive crust (in most places aside from shaded aspects at treeline elevations) and perhaps new surface hoar (where it survived the heat, rain and sun) could be buried by as much as 5-10cm of fresh snow or deeper wind slabs. The early January surface hoar/ facet layer is typically down 70-90 cm. Recent avalanches have been failing on this interface in the north of the region (see avalanche discussion) and it continues to produce sudden planar results in snow pit tests. In general, the lower snowpack is well settled and strong, apart from some thin snowpack areas where basal facets exist.

Problems

Wind Slabs

An icon showing Wind Slabs
Touchy fresh pockets of wind-deposited snow are lurking on the downwind side of ridgecrests and terrain features. Expect them to get bigger and touchier throughout the weekend.
Travel on ridges to avoid freshly wind loaded features. >Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 4

Persistent Slabs

An icon showing Persistent Slabs
A buried weak layer of surface hoar remains a concern, especially around Golden where it has recently created some very large avalanches.
Be cautious around open slopes and convex rolls at and below treeline where buried surface hoar may be preserved. Big alpine features are also suspect.>Avoid thin, rocky or sparsely-treed slopes.>Avoid convexities or areas with a thin or variable snowpack.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

3 - 5

Valid until: Feb 13th, 2016 2:00PM