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Archived

Avalanche Forecast

Apr 26th, 2014–Apr 27th, 2014
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

It is important to monitor the weather while on your trip.  The avalanche hazard will rise with prolonged exposure to direct sunlight.

Weather Forecast

Snowy conditions will continue through to Sunday morning with 10 cm possible.  Light Easterly winds will shift to SW.  Temps will remain cool with the freezing level only rising to 1700 m on Sunday.  Cloudy cool conditions with some flurries through to Monday.  Sun and warm temperatures will begin on Tuesday.

Snowpack Summary

Very little new snow from predicted storm.  There is rain crust from the valley bottom to 2,350m and a sun crust into Alpine on solar aspects.  Settled wind slabs are on NE aspects from 2,000 m to the alpine. Moist and wet snow exists below the crust extending into the alpine on solar aspects. The mid-pack is solid on North aspects. Large cornices.

Avalanche Summary

No field trips today.  On April 23rd, avalanche control produced size 1-2 soft slabs at 2200m sliding on a rain crust and cornice failures produced size 3's on steep un-skiable terrain (Cromwell and Boundary peak).

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Sunday

Avalanche Problems

Storm Slabs

Slabs that formed on the April 22 crust have not been reactive lately. It is still possible to trigger these slabs on steep terrain below ridgelines or convex features.
Avoid lee and cross-loaded terrain near ridge crests.Be cautious as you transition into wind affected terrain.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Large triggers such as cornice failures have the potential to initiate deep avalanches. Depending on aspect, could be a wet or dry slab characteristic.
Pay attention to overhead hazards like cornices.Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3