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Archived

Avalanche Forecast

Dec 6th, 2020–Dec 7th, 2020
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
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Winter is coming! Expect up to 25cm of new snow starting to fall Monday evening and continuing through late Tuesday afternoon.

Weather Forecast

Temperatures returning to seasonal normals. Snow beginning Sunday night and continuing through to Tuesday evening. 25cm of snowfall is forecasted for the next 2 days. Winds will increase and come from the SW during this period

Snowpack Summary

Previous winds have stripped the snow from all fetches in the alpine and open tree line creating slabs and cross loading in gullies and depressions. Warm temperatures have resulted in a melt freeze crust on solar aspects. Snow depth at tree line is up to 90cm with the Nov 4 crust down 50cm. Basal weakness continue to develop.

Avalanche Summary

Several wind slab avalanches have been observed on alpine NE aspects up to size 2 in the Jasper townsite area. No other avalanches observed or reported. No road patrols today

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Avalanche Problems

Wind Slabs

Widespread wind effect in the alpine and exposed treeline - highly variable with laminated slabs and bare ground. Be cautious of unsupported slabs.

  • If triggered the wind slabs may step down to deeper layers resulting in larger avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Persistent Slabs

The Nov. 4 crust is down about 50cm at tree line (2000m) and breaking down. Be careful around "thin to thick" areas where deep slabs could be triggered. Basal weakness continues to develop and could be reactive to large loads

  • Be cautious in shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2.5