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Archived

Avalanche Forecast

Dec 10th, 2013–Dec 11th, 2013
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
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
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: Glacier.

Expect fast moving sluffs with the potential to know you over today and be mindful of people below you.

Weather Forecast

Nil to very light snow is  forecast until Wednesday night when more significant precipitation is expected to arrive to the interior with a gradual warming in temperature.

Snowpack Summary

25cm of low density storm snow sits over the December 8 surface hoar layer at lower elevations and over variable wind slabs up high. The November 28 surface hoar layer is down around 35-40cm over a facetted mid and lower snowpack. The November 12 surface hoar layer is down 60-110cm.

Avalanche Summary

1 natural avalanche size 1.5 yesterday east of the Rogers Pass summit on Mt Macdonald.

Confidence

Avalanche Problems

Loose Dry

25cm of new snow sits over a newly buried surface hoar layer down low and wind slabs up high. Riders should  expect sluffing in steep terrain that could reach down into deeper unconsolidated layers and gain mass.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.Be aware of party members below you that may be exposed to your sluffs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Wind Slabs

Variable hard and soft wind slabs from last week are now buried down 25cm.
Be cautious as you transition into wind affected terrain.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Persistent Slabs

The surface hoar layer from mid November is buried down 60-110cm. Triggering this layer is most likely in and around shallow snowpack areas with large consequences.
Be aware of thin areas that may propogate to deeper instabilites.Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 3 - 4