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Archived

Avalanche Forecast

Apr 7th, 2016–Apr 8th, 2016
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Jasper.

Expecting the avalanche hazard to rise rapidly on Friday on all elevations and aspects as freezing level climbs to 3500 m and plenty of sun.  Avalanche control planned for Icefields Parkway starting at 16:30 hrs on Friday.

Weather Forecast

Freezing level dipping to 1500 m tonight then soaring to 3500 m by noon Friday with clear skies.  Good crust recovery forecasted Friday night  with moderating temperatures through the weekend could make for good corn skiing.

Snowpack Summary

A melt freeze crust will form tonight but will deteriorate rapidly on all aspects and elevations on Friday afternoon as temperatures spike and with intense solar radiation.  A persistent slab, 30 to 70cms thick, will be of greatest concern on Northerly aspects. Pockets of thin slab on lee aspects. 

Avalanche Summary

Large (sz 3) slab avalanches on North alpine aspects starting to be seen.  Old slab and loose wet avalanche activity to size 2.5, mostly on solar aspects observed by field teams along the Icefields Parkway on Wednesday.

Confidence

Avalanche Problems

Deep Persistent Slabs

The forecasted hot sunny weather on Friday will be a trigger for this problem on all aspects and elevations.
Avoid shallow snowpack areas where triggering is more likely.Travel early before the heat of the day, and avoid big slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Very Likely

Expected Size: 2 - 4

Loose Wet

The freezing level is rising to 3500 m tomorrow.  We are expecting to see loose wet avalanches on most slopes.
Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.Be very cautious with gully features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely - Certain

Expected Size: 1 - 2

Cornices

Large hanging cornices will weaken with rising temperatures. Use caution traveling below or near them.
Cornices become weak with daytime heating.

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

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 2