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Archived

Avalanche Forecast

Nov 24th, 2012–Nov 25th, 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
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
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: Jasper.

Good skiing can be found in sheltered areas, but careful snowpack evaluation is necessary to determine if there are previous wind slabs buried under the new snow.

Weather Forecast

Scattered light precipitation expected through the weekend with light westerly winds. Freezing levels to stay low and temps consistent in the -5 to -10 range.

Snowpack Summary

10cm in the past 24 hours brings the 5 day total to over 50cm at treeline elevation. This is a significant load on the November snowpack and may increase the likelihood of triggering persistent slabs that are buried under storm snow.  New windslabs can be found on exposed Northerly aspects.

Avalanche Summary

Marmot Basin reported several new natural slab avalanches on North aspects above 2200m. These slabs were roughly 10-30cm thick and in the size 1-2.5 range.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Numerous natural slab avalanches have been observed in the past 48hrs, mostly in wind loaded features above 2300m. The predominant Southerly winds make the Northern aspects the prime suspect for new windslab formation.
Be cautious as you transition into wind affected terrain.Avoid lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

Previous wind slabs can be found buried beneath the recent storm snow on lee aspects in exposed terrain.
The recent snow may now be hiding windslabs that were easily visible before the snow fell.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3