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Archived

Avalanche Forecast

Jan 7th, 2020–Jan 8th, 2020
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
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
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.

Avoid avalanche terrain. A great time to go to the ski hill.

Weather Forecast

Up to 30cm of new snow with light west winds forecasted for the next 12-18 hours and then clearing late Wednesday morning. Cooler temperatures and clearer skies forecasted for late Wednesday into Friday with light to moderate winds from the west.

Visit CAA's Mountain Weather Forecast for more specific details.

Snowpack Summary

Up to 30cm of new snow forecasted could overlie last weeks storm snow. Possible wind slab formation could occur on lee aspects in the alpine and treeline. These would overlie buried surface hoar up to 2200m in sheltered areas. Wind slabs on lee features at treeline and above. The bottom of the snowpack consists of depth hoar and facets

Avalanche Summary

Avalanche activity expected to increase tomorrow with new snow, this will  be dependent on the amounts received. No new natural avalanche activity observed or reported today due to limited field observations. Avalanches could run full path and into below treeline.

Confidence

Forecast snowfall amounts are uncertain on Wednesday

Avalanche Problems

Wind Slabs

New snow will bury and could trigger existing wind slabs as well as form new ones at treeline and above. Consider avoiding terrain which is thin to thick and/or significant overhead wind loaded features.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

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

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3

Deep Persistent Slabs

This weakness could be triggered by large loads or from thin spots in the snowpack.

  • Be aware of thin areas that may propogate to deeper instabilites.
  • Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3

Loose Dry

Caution in steep gullies and terrain traps where a small sluff could have large consequences. Avoid terrain where this problem can initiate slab avalanches on deeper layers.

  • Watch for terrain traps where small amounts of snow will acumulate into deep deposits.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 2