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Archived

Avalanche Forecast

Feb 11th, 2015–Feb 12th, 2015
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high

Regions: Jasper.

Warm temperatures below treeline will create isothermal conditions resulting in increasing possibility of loose snow avalanches.  These temperatures will also increase the hazard at treeline and above.

Weather Forecast

The freezing level will rise to 2000 m Thursday.  Light precipitation will continue with sunny breaks through to Saturday.  Forecast models are uncertain for the weekend but another large pulse of  precipitation is possible on Saturday.

Snowpack Summary

There is a wide variation in the snowpack across the forecast region.  In the Icefields Area, there is significant snow available for transport.  SW winds will be forming wind slabs below ridge lines and along gulley features. Up to 1 meter of storm slab is sitting over the Jan 29 rain crust on all aspects at treeline and above.

Avalanche Summary

Minor sluffing continues out of steep terrain.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Saturday

Avalanche Problems

Persistent Slabs

The 1 meter of storm snow has transitioned into a persistent slab. This slab is sitting on a raincrust/surface hoar weakness.
Use caution in lee areas in the alpine and treeline. Recent storm snow has formed touchy slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 4

Deep Persistent Slabs

This layer remains a concern in isolated areas above treeline and may be triggered by large loads.
Avoid steep slopes below cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3