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Archived

Avalanche Forecast

Dec 21st, 2012–Dec 22nd, 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
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.

Periods of sun may trigger small loose avalanches. It may also cause cornices to fail. Avoid areas where the snow feels stiff and punchy. Not only is it possible to trigger these windslabs, but the skiing will be much better elsewhere.

Weather Forecast

A weak ridge of high pressure combined with an arctic front moving southwards will bring cool temps, moderate southerly winds and some sunshine today. Over the weekend expect temps to remain cool, mostly cloudy skies with periods of sun, light to moderate southerly winds, and a few flurries.

Snowpack Summary

New snow in the last 24hrs has been denser, creating slightly "upside down" conditions. Periods of strong SW winds yesterday formed soft windslabs in immediate lees. The Nov28 surface hoar is down about 80cm where it exists. The early Nov crust is widespread and down about 1.5m. Tests on these layers indicate they would be hard to trigger.

Avalanche Summary

Periods of strong southerly winds triggered large natural avalanches from steep, lee avalanche paths overnight.

Confidence

Avalanche Problems

Wind Slabs

Spikes in wind speeds in the last 24hrs have created fresh windslabs. Hard slabs exist right at ridgecrests, with soft slabs in the lees. Where they exist, these slabs may be triggered by skiers or riders.
Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.Be cautious as you transition into wind affected terrain.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Loose Dry

It's looking sunny out there this morning. Expect small, loose avalanches from steep solar aspects today.
Minimize exposure to sun exposed slopes when the solar radiation is strong.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2