Avalanche Forecast

Issued: Jan 5th, 2016 8:44AM

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

Avalanche Canada esharp, Avalanche Canada

Watch for pockets of wind slab in cross loaded alpine terrain and immediately lee of ridge crest.

Summary

Confidence

High - The weather pattern is stable

Weather Forecast

Skies will be overcast and there may be periods of isolated flurries on Wednesday although significant accumulations are not expected. Thursday could see slightly more snow (up to 5cm) while Friday looks to be mainly dry. Winds are expected to be light and variable. There is poor agreement in the weather models about how high the freezing level with get but I'm expecting them to push as high as 1000m on Wednesday before the temperature cools as an Arctic air mass descends on Friday.

Avalanche Summary

No new avalanches were reported over the weekend but sluffing is expected to have occurred on steep south facing slopes.

Snowpack Summary

A skiff of new snow now covers a widespread layer of surface hoar. This surface hoar sits on a crust on aspects exposed to the sun and facets in sheltered and shaded features. Recent mild temperatures have caused the upper snowpack to settle. In sheltered areas around 40 cm of snow now rests on 10 cm of facets. This interface has been producing moderate to hard shears in recent snowpack tests. The field team was out traveling around the region last week and they found surprisingly little wind effected snow with the exception of thin stiff wind slabs sitting above facets in the immediate lee of features in the Alpine. It sounds like the story is a little different around Castle Mountain where upper elevation terrain has seen quite a bit of recent wind out of the west and now north.

Problems

Wind Slabs

An icon showing Wind Slabs
In the last week, winds have been out of the southwest, west, and north. This has created both isolated pockets of wind slabs and cornices at ridge crests.
Use caution in lee areas in the alpine. Recent wind loading has created thin wind slabs. >Extra caution needed around cornices with current conditions. >

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Jan 6th, 2016 2:00PM

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