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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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Northwest Inland.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Saturday: Light snowfall - Light to moderate southerly winds - Freezing level at 700m Sunday: Light snowfall - Light and variable winds - Freezing level at 600m Monday: Some clearing - Light and variable winds - Freezing level at surface

Avalanche Summary

Observations have been limited, but reports suggest that fresh wind slabs are touchy with a few small skier-triggered 10-40cm thick slabs on wind-exposed rolls at treeline and below.

Snowpack Summary

Intense wind-loading was observed at all elevations on Wednesday with snow surfaces either getting scoured or packed into hard wind slabs. Warm temperatures and sun-exposure have moistened the surface snow on all aspects below around 1000m and some areas as high as 1600m. Recent snowpack tests on a northeast aspect at 1480m gave several resistant planar shears the recent storm snow and two hard resistant planar shears down 37cm and 70cm where the total snowpack depth was 5m. The mid February interface, down around 60cm, is variable and generally consists of a strong melt freeze crust below 1000m. Above that elevation, expect to find buried facets, and/or surface hoar (in more sheltered areas), and/or a sun crust on southern aspects. The surface hoar is not widespread but is responsible for much of the larger avalanches that occurred earlier this week. This layer should be on your radar, as it may be susceptible to rider triggers.

Avalanche Problems

Wind Slabs

Recent intense winds have deposited fresh wind slabs, generally below ridgecrests, behind terrain features and in gullies. Cornices are large and weak and could trigger large wind slabs below.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 4

Persistent Slabs

The persistent weak layer continues to be buried by a few cm each day. Avalanches on this layer have not been reported for a few days, but we feel that it could still be easily triggered by skiers and riders.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 3 - 6