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Archived

Avalanche Forecast

Mar 9th, 2012–Mar 10th, 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
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
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.

Warm temperatures and freezing levels to 2000 m. are forecast for today. A system will spread light precipitation this afternoon. Moderate precipitation is on tap overnight and for Saturday. Danger levels will rise with rapid temperature increase.

Avalanche Problems

Storm Slabs

The storm slab is settling into a cohesive slab with several low density weaknesses still evident in the upper 70cm. Larger triggers such as skiers dropping cliffs, cornice fall or even large tree bombs have triggered these slabs in recent days.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3

Wind Slabs

Consistent strong S winds are producing wind slabs and deep drifts on open slopes at ridgetop elevations. Expect wind slabs 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 80-120cm 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 moraines.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3