Avalanche Forecast

Issued: Jan 6th, 2013 9:08AM

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 triley, Avalanche Canada

Summary

Confidence

Fair - Due to variable snowpack conditions for the entire period

Weather Forecast

Overnight and Monday: Flurries overnight becoming snow in the morning should bring a total of 5-10 cms. Southwest winds are expected to build to moderate with strong gusts during the morning snow fall. Winds should become light Westerly in the afternoon.Tuesday: Expect flurries with little to no accumulation combined with moderate Westerly winds.Wednesday: Light snow developing during the day combined with light Northwest winds.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

Thin layers of dry cold snow are accumulating each day. In some areas this new snow has been transported into wind slabs. The recent cold and dry weather has caused the surface snow to facet and become weakly bonded. This weak bonding has resulted in dry loose snow sluffing out of steep terrain. Forecast new snow on top of this weak unconsolidated surface should continue to sluff easily. The base layers of the shallow snowpack have also facetted and become weaker. The relatively strong mid-pack has formed a bridge above the deep facets. The forecast storm over the next few days may create a storm slab above the weak surface layers, and/or over-load the mid-pack bridge. This type of incremental loading requires frequent assessments of the amount of loading above the weak layers, and whether that load will react as a consolidated slab.

Problems

Storm Slabs

An icon showing Storm Slabs
A thin soft storm slab is expected to develop overnight. Pockets of wind slab are expected to continue to develop during the storm.
Avoid freshly wind loaded features.>Be cautious of sluffing in steep terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 4

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.
Avoid thin, rocky or sparsely-treed slopes.>Carefully evaluate and use caution around thin snowpack areas.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 5

Valid until: Jan 7th, 2013 2:00PM

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