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Archived

Avalanche Forecast

Dec 23rd, 2012–Dec 24th, 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
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Weather Forecast

Today should bring more flurries, light to moderate southerly winds and sunny periods this afternoon. Monday should be mostly clear and dry with light southerly winds. Another low pressure starts to move into the region on Tuesday bringing increasing cloud and scattered flurries.

Snowpack Summary

Very soft slabs exist on lee and crossloaded  features at treeline and above. 10cm of new snow overnight sits on 35cm of settled storm snow over well settled snow. The Nov28 surface hoar is down about 80cm where it exists, and the early Nov crust is widespread and down about 1.5m. Tests on these layers indicate they would be hard to trigger.

Avalanche Summary

Yesterday, skiers triggered very soft slabs on steep north aspects. They were triggered from lee and crossloaded features; just below ridge crest on a gully. The avalanches were size 1-1.5, 20-30cm deep and propagated 30m wide. They ran about 100m.  Also, 3 natural size 2 avalanches were observed from north aspects.

Confidence

Avalanche Problems

Wind Slabs

The storm snow is forming very soft slabs on lee and crossloaded features. These were easily triggered yesterday on steep slopes, and are now 10cm deeper with overnight snow. These slabs may be more reactive due to a period of strong wind overnight.
Caution in lee and cross-loaded terrain near ridge crests.Ride slopes one at a time and spot for your partners from safe locations.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3