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Archived

Avalanche Forecast

Mar 8th, 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
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

The key today is to keep the deeper weaknesses in your mind as you assess your route through the day. Caution is still advised, particularly where surface hoar will be preserved. 2000m freezing levels with periods of sun will increase danger levels.

Avalanche Problems

Storm Slabs

Since last Friday, over 1m of snow has fallen. The storm slab is settling into a cohesive slab with several low density weaknesses still evident in the upper 70cm. Some fast sluffing was observed yesterday which could trigger these weaknesses.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Wind Slabs

Consistent strong S winds are producing windslabs and deep drifts on open slopes at ridgetop elevations. Expect windslabs just below ridges but look for stiffer snow well down the slope also.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Feb 8 surface hoar layer is 1-1.5m deep. Tests show that if triggered this layer will propagate and produce large avalanches. Watch sheltered areas near treeline and N and E aspects well below treeline in creek drainages and morraines.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3