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Avalanche Forecast

Mar 4th, 2012–Mar 5th, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Northwest Inland.

Confidence

Good

Weather Forecast

Moderate to strong southwest winds and another 3-5 cm of new snow are expected by Monday morning. Continued unsettled weather is forecast for Monday bringing some flurries during the day. A small ridge of high pressure may provide some clearing skies during the night or early Tuesday morning with building northwest winds. Snow should start during the day Tuesday as winds continue to build and veer towards the west. Periods of moderate precipitation are forecast overnight resulting in about 5-10 cm of new snow with a freezing level of about 500 metres. The winds should calm and clock back to the northwest on Wednesday as a weak ridge passes through the region before the next Pacific frontal system approaches.

Avalanche Summary

No new avalanches have been reported from the region.

Snowpack Summary

Moderate southwest winds transported the 3-5 cm of new snow that we have received over the past two days into thin new windslabs at ridgetops. Currently, up to 60cm of snow sits over the mid February interface. This interface is variable, it consists of a strong melt freeze crust below 1000m, above 1000 m exists facets, surface hoar (in more sheltered areas), sun crust or wind press. 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

New snow and strong westerly winds are developing thin new windslabs in the alpine and at treeline. Windslabs may fail naturally or be easily triggered with light additional loads.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - 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

Expected Size: 3 - 6