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Archived

Avalanche Forecast

Nov 26th, 2017–Nov 27th, 2017
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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: Jasper.

Icefields Parkway is closed from Saskatchewan Crossing to Athabasca Falls due to planned avalanche control. Check Alberta 511 for updated opening time.

Weather Forecast

15cm of storm snow with a further 15 to 20 cm forecasted overnight for Sunday. Snow to continue through until Tuesday afternoon. Cool alpine Temperatures up to -5. Strong to Moderate SW winds with gusty extreme winds to accompany this the remainder of the storm cycle.

Snowpack Summary

30cm of recent storm snow over a 10cm hard crust with more coming. A persistent slab between 40cm - 150cm thick sits on the Halloween Crust, low in the snowpack. This crust can be found up to 2,700m depending on its location. Wind and storm slabs likely exist in the upper alpine.

Avalanche Summary

Field team on Sunday monitoring growing storm slab over the Black Friday crust down 35cms. No new avalanches observed on the crust but visibility poor above TL. On Nov. 22nd a field team remote triggered 3 simultaneous size 2 persistent slabs 60-150m away on either side of the wind scoop at parkers ridge.

Confidence

Avalanche Problems

Storm Slabs

Building slabs over the Black Friday (Nov. 23rd) crust will continue to grow overnight and become more sensitive to light triggering by Monday morning. Extremely cautious travel is advised until the hazard subsides. 
Avoid avalanche terrain during periods of heavy loading from new snow and wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Wind Slabs

Sensitive wind slabs building quickly at ridge tops and if triggered, has the potential to step down to the deeper instability.
Avoid freshly wind loaded features.Avoid avalanche terrain during periods of heavy loading from new snow and wind.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

This is a complex problem which is hard to assess and predict. Give yourself a wide margin and make conservative terrain choices.
Be aware of the potential for wide propagations.Be wary of slopes that did not previously avalanche.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3