Avalanche Forecast

Issued: Jan 8th, 2013 9:24AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Storm Slabs and Deep Persistent Slabs.

Avalanche Canada pgoddard, Avalanche Canada

Summary

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Wednesday

Weather Forecast

Wednesday: Moderate NE wind. Alpine temperature near -10. No precipitation.Thursday: Moderate NW winds. Alpine temperature near -12. Light snow.Friday: Light W wind. Alpine temperature near -9. 8-12 cm snow.

Avalanche Summary

Snowmobilers witnessed naturally-triggered slabs and loose dry sluffs in the Seaton Basin on Monday.

Snowpack Summary

New snow is building up over a weak, faceted old snow surface, which may lead to storm slab development or loose dry sluffing. In wind-affected areas, wind slabs have formed behind terrain breaks such as ridges and ribs. A strong mid-pack overlies a weak base layer of facets and the remnants of a crust. As snow builds up incrementally over these weaknesses, avalanche danger is also likely to gradually increase. Under these circumstances, it can be hard to evaluate if/when the tipping point will occur which leads to slab avalanches failing on persistent weak layers. Keep track of snow loading in your local area and adopt a cautious approach to terrain selection.

Problems

Storm Slabs

An icon showing Storm Slabs
Soft storm slabs are slowly developing with daily snow falls combined with moderate shifting winds.
Avoid freshly wind loaded features.>Be cautious as you transition into wind affected terrain.>Use ridges or ribs to avoid pockets of wind loaded snow.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 3

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
A deeply buried facet/crust weakness exists near the base of the snowpack. This layer could be triggered by large loads such as a cornice collapse or from a thin-spot trigger point.
Be aware of thin areas that may propagate to deeper instabilites.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 5

Valid until: Jan 9th, 2013 2:00PM

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