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Avalanche Forecast

Jan 11th, 2014–Jan 12th, 2014
Alpine
4: High
The avalanche danger rating in the alpine will be high
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
4: High
The avalanche danger rating in the alpine will be high
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Jasper.

The Icefields Parkway is closed due to high avalanche danger.  It will not open until control work has been completed.  The new storm snow is unstable and will need time to stabilize.  Resist the urge and stick to safe lines on lower angle terrain!

Weather Forecast

The major storm has past however further amounts of up to 20-30 cm are possible by Monday night.  Winds are expected to increase to strong from the W to NW.  Temperatures will dip Sunday morning then rebound.  Temperatures will increase to above freezing with the possibility of rain later in the week.

Snowpack Summary

>35cm of storm snow has fallen since Friday.  Moderate SW winds have created deep soft slab conditions in the alpine and open TL slopes.  In many locations, these new slabs are sitting on weak basal facets.

Avalanche Summary

Very poor visibility precluded avalanche observation however numerous large avalanches were heard through out the day from the Icefields to Sask Xing.  Sluffing of storm snow on steep banks was observed as well as soft slab avalanches to sz 1.5 at treeline.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Avalanche Problems

Storm Slabs

>35 cm of storm snow has fallen in the past 24 hrs and has been redistributed by moderate SW winds. This new snow is overloading the weak snowpack below resulting in large deep avalanches.
Avoid avalanche terrain during periods of heavy loading from new snow and wind.The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Very Likely

Expected Size: 1 - 4

Deep Persistent Slabs

In many areas, the basal facet weakness has been avalanched away, where this has not happened, there is a lot of snow sitting on top of this unstable weakness.
Be aware of thin areas that may propogate to deeper instabilites.Avoid steep, open slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

These winds slabs have now been buried by the new snow so will be hard to locate. 
Avoid ice climbs that are in terrain traps below large start zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2