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Archived

Avalanche Forecast

Mar 6th, 2012–Mar 9th, 2012
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Waterton Lakes.

The weekend brought up to 60cm of new snow. Forecast are calling for strong NW winds Wed/Thur which will build new wind slabs. Warming on Thur/Fri will reduce stability, especially below treeline. Watch for moist snow over crusts at lower elevations.

Avalanche Problems

Storm Slabs

Temperature changes and strong winds during the weekend storm created weak layers down 20 and 50cm. Stiffening of the slab over the next few days with wind and warm temps could make triggering these slab easier.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Previous wind slabs are now buried 15cm and still could be triggered by skiers. NW winds forecast for Wed will be building windslabs outside of normal locations. With all the new snow from the weekend, these slabs will grow quickly.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Suncrusts now down70 to 80cm can be found on steep southerly aspects. Watch for these in thin or wind scoured snowpack areas. Probability of triggering is diminishing however consequence continues to grow.

Aspects: North, North East.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3