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Archived

Avalanche Forecast

Apr 9th, 2017–Apr 10th, 2017
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Jasper.

The slopes look inviting but Jasper Forecasters are still leery of big slopes that have not seen ski traffic or previous avalanche activity. 

Weather Forecast

Melt-freeze cycle in the valley bottoms. Light winds and cool temps keeping the surface snow dry above tree-line. Pulses of precipitation (rain below tree-line and snow above) into the week.  Starting to see strong diurnal spring temperature cycle developing.

Snowpack Summary

Good skiing  above 2000m.  Icefields has10cm of settled storm snow. This rests on a solid mid-pack which bridges the weak base above 2000m. The base is a combination of weak facets and depth hoar mixed around a Nov rain crust. Consistent melt-freeze cycle below tree line. Surface crusts are breaking down by mid morning.

Avalanche Summary

A couple sz 3 avalanches in steep un skiable terrain NE alpine where cornice failure has triggered deep persistent slab.

Confidence

Timing or intensity of solar radiation is uncertain on Tuesday

Avalanche Problems

Deep Persistent Slabs

This problem will persist. Activity has subsided but, need to keep this on your radar. It can be triggered by large loads such as cornice failures or human triggered from shallow spots or steep unsupported slopes.
Be cautious in shallow snowpack areas where triggering is more likely.Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4

Cornices

Cornice failure is hard to predict. Some very large cornices are out there so wise to give them a wide berth.
Give cornices a wide berth when travelling on or below ridges.Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Loose Wet

Isothermal conditions possible as melt freeze breaks down by late morning.
Minimize exposure to steep slopes on warm or sunny days.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3