Avalanche Forecast

Issued: Jan 5th, 2017 4:04PM

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

Avalanche Canada cam_c, Avalanche Canada

Touchy wind slabs are lurking in unusual places, such as south aspects. Persistent slabs still can't be totally trusted, especially in shallow snowpack areas.

Summary

Confidence

High -

Weather Forecast

FRIDAY: Cloudy with sunny periods and isolated flurries bringing trace amounts of fresh snow, light southerly winds, alpine temperature around -15.SATURDAY: Cloudy with sunny periods and isolated flurries and trace amounts of fresh snow, light southeasterly winds, alpine temperature around -8.SUNDAY: Mainly cloudy with light flurries, light becoming moderate southwesterly winds and alpine temperatures around -10.

Avalanche Summary

Reports from Tuesday and Wednesday include a few natural and human-triggered sluffs and wind slab avalanches up to Size 2 and a Size 2.5 cornice fall, but generally no new avalanches. Expect wind slabs, cornices and loose surface snow to remain sensitive to human triggers for the forecast period.

Snowpack Summary

Surface hoar and surface facets have likely been buried by a light dusting of fresh snow. In exposed areas at all elevations, recent winds have resulted in scouring, hard wind slabs, and thicker reactive wind slabs in unusual places as the winds shifted from west to northeast. Moderate southeasterly winds are likely keeping winds slabs fresh in some areas, while old wind slabs are breaking down with faceting in other areas. Facets and/or surface hoar buried mid-December has been giving hard and broken or no results in snowpack tests where it is down around a metre or more. However, recent snowpack tests in a shallower area gave moderate sudden planar results on this persistent weakness where it was found as surface hoar down 55 cm. This suggests that the primary concern for persistent slab avalanches is in shallow snowpack areas; however, the potential for step-down avalanches remains where it is deeper. The lower snowpack is well bonded and features a thick rain crust near the ground.

Problems

Wind Slabs

An icon showing Wind Slabs
Touchy wind slabs are lurking below ridge crests and behind terrain features on all aspects Watch for wind slabs in unusual places, including open areas at lower elevations.
Use ridges or ribs to avoid pockets of wind loaded snow.Avoid travelling in areas that have been reverse loaded by winds.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 6th, 2017 2:00PM