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Archived

Avalanche Forecast

Nov 27th, 2012–Nov 28th, 2012
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
1: Low
The avalanche danger rating below treeline will be low
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Features of concern remain: ridgetop transitions with local winds creating surface slabs plus shallow locations where deeper instabilities could be triggered. Despite less natural activity, human triggered avalanches remain possible.

Weather Forecast

Temperatures will trend cooler the next few days with continued unsettled weather. A few centemetres every day this week with continued light winds. Expect winds to be stronger at some local ridgetop locations or higher alpine elevations. 

Snowpack Summary

Minimal wind affect observed and 10-15cm of low density surface snow in most areas. Windslabs can be found in the alpine buried under last week's snow and may be developing at exposed ridgetops.  Several small whumphs observed in shallow areas. Winds remain calm for the most part.

Avalanche Summary

Several loose natural point releases observed on in steep rocky terrain did not trigger slopes below.  No new slab avalanches have been observed for 3 days. Caution is still warranted despite the decrease in natural activity.

Confidence

Wind effect is extremely variable

Avalanche Problems

Wind Slabs

No new natural activity on this layer has been noted for a few days yet potential still exists on steep unsupported wind affected slopes. This layer can be found under 10-20cm of recent storm snow, at ridgetops, and where reverse loading occurred.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.Avoid freshly wind loaded features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3

Persistent Slabs

Persistent slabs are found in the mid-pack overlying crust or developing facets. Snow load from wind deposition or significant snowfall may increase the likelihood of natural avalanches. Consequences would be severe if skier triggered.
Avoid shallow snowpack areas where triggering is more likely.Be alert to conditions that change with elevation.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3