Avalanche Forecast

Issued: Jan 24th, 2012 9:14AM

The alpine rating is high, the treeline rating is high, and the below treeline rating is considerable. Known problems include Wind Slabs and Storm Slabs.

Avalanche Canada triley, Avalanche Canada

Summary

Confidence

Good - -1

Weather Forecast

Heavy precipitation on Tuesday should lighten to flurries by Wednesday mid-morning. Strong southwest winds are expected to continue until Wednesday evening, when the wind should clock to the northwest as a ridge of high pressure builds over the interior. The freezing level is expected to rise to near 1000 metres during the evening on Tuesday, and then drop back to valley bottoms. Thursday and Friday should be drier and cooler with alpine temperatures dropping to about -14.0

Avalanche Summary

Natural avalanches up to size 2.0 reported on east and southeast aspects in the alpine that released in the recent storm snow.

Snowpack Summary

The new storm has developed a thick blanket of dry light snow above the cold dry surface. If this new storm warms up a bit, expect a storm slab to consolidate above this cold relatively weak layer. Watch for new windslabs developing due to forecast strong southwest winds. Some surface facetting during the recent cold spell. Strong temperature gradient in the top 30 cm. Stiff windslabs have developed in the alpine and at treeline. Some areas reporting a crust that is now buried by about 50 cm of cold dry light snow. Strong well settled mid-pack. Cornice structures are weak and have been growing fast, and falling off!

Problems

Wind Slabs

An icon showing Wind Slabs
The new storm on Tuesday is expected to build new windslabs that are expected to be easily triggered by light loads like skiers or riders.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

2 - 6

Storm Slabs

An icon showing Storm Slabs
A storm slab is expected to develop due to strong southwest winds, heavy precipitation, and rising freezing levels.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

2 - 6

Valid until: Jan 25th, 2012 8:00AM