Avalanche Forecast Sea to Sky

Date Issued: Valid Until:

Avalanche Canada pgoddard, Avalanche Canada

Avalanche Forecast

Mon Dec. 24th ยท 8:15AM

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Moderate
Wind Slabs Wind Slabs
Loose Dry Loose Dry

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Confidence

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

Weather Forecast

Tuesday: Moderate to strong SE winds. Alpine temp -8. Light snow.Wednesday: Light SW winds. Alpine temp -8. A few cm snow.Thursday: Light SW winds. Alpine temp -7. No precipitation.

Avalanche Summary

On Sunday, several size 1-1.5 wind slabs were triggered by explosives and skiers. One size 2 slab was triggered in a steep high alpine start zone.

Snowpack Summary

Over a metre of snow has fallen this week with strong SE winds, which has created wind slabs in alpine and open treeline terrain. New cornices exist. In sheltered areas below treeline, very deep loose snow has built up. Three surface hoar layers in the upper/mid snowpack appear to be gaining strength. In general, the mid-pack is strong.Near the base of the snowpack, a crust/facet layer has become unlikely to be triggered. However, professionals are still mindful of thin snowpack trigger areas or large loads which could wake it up again, leading to a very large avalanche.

Problems

Wind Slabs

Wind Slabs

Winds have shifted available snow into slabs behind ridges and ribs. These could be triggered by the weight of a person or snowmobile.

Stay off recent wind loaded areas until the slope has had a chance to stabilize.>Stay well to the windward side of corniced ridges.>Use ridges or ribs to avoid pockets of wind loaded snow.>

Aspects: North, North East, East, South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood

Likely - Possible

Expected Size

1 - 4
Loose Dry

Loose Dry

The volume of loose dry snow could knock you over or carry you into a terrain trap. Be cautious in any steep terrain.

On steep slopes, pull over periodically or cut into a new line to manage sluffing.>Be aware of party members below you that may be exposed to your sluffs.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 4