Avalanche Forecast

Issued: Jan 4th, 2016 7:55AM

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

Moderate - Timing of incoming weather systems is uncertain

Weather Forecast

We're looking at more mainly benign weather through the forecast period. Skies will be overcast and there may be periods of isolated flurries although accumulations are not expected to be significant. Winds will be mainly light from the southwest. There is poor agreement in the models about how high the freezing level with get with the high resolution regional model calling for it to rise as high as 1000m on Tuesday while the global calls for it to stay at valley bottom.

Avalanche Summary

No new avalanches were reported over the weekend but sluffing is expected to have occurred on steep south facing slopes. On Friday control work produced loose dry avalanches to size 1 on E and NE aspects. On Wednesday control work produced a size 2 storm slab on a high elevation east facing feature.

Snowpack Summary

The recent temperature inversion has helped the upper snow pack to settle a bit, at least at upper elevations. In sheltered areas around 40 cm of decomposing storm snow rests on 10 cm of facets. This interface has been producing moderate to hard shears in recent snowpack tests. In wind exposed terrain you're likely to find pencil hard wind slabs sitting on the facets. Our field team was out traveling around the region last week and they found surprisingly little wind effected snow. 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 wind slabs and cornices that are most problematic for folks traveling on or near ridge crest. Upcoming SW winds are expected to build new wind slabs.
Extra caution needed around cornices with current conditions. >Use caution in lee areas in the alpine. Recent wind loading has created thin wind slabs. >

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Jan 5th, 2016 2:00PM

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