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Archived

Avalanche Forecast

Nov 18th, 2017–Nov 19th, 2017
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
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
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.

Monitor Sunday's storm for snow amounts increasing the hazard through the day. Plan your travels accordingly.

Weather Forecast

20-40cm of storm snow will arrive Sunday afternoon into Monday morning with strong SW winds and -6 to -11. The storm will clear Monday followed by another 20cm storm on Tuesday night. 

Snowpack Summary

Strong SW winds is affecting exposed slopes and ridge tops in the alpine the last 24 hours creating windslabs. Generally a strong, and supportive early winter snowpack exists with depths ranging from 30 to 100+ cm depending on aspect and exposure to wind. The snowpack will change with incoming storm Sunday.

Avalanche Summary

No new natural activity reported from a field team on Saturday. Climbers should still remain vigilant as even triggering a small avalanche in a gully feature or above cliffs can have severe consequences. Expect increased likelihood of avalanches with incoming storm on Sunday.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

Avalanche Problems

Storm Slabs

Hazard will increase during the day on Sunday as loading of storm snow arrives. Exact snow amounts are uncertain.
Use caution when traveling in the alpine and treeline. Storm snow will form touchy slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Wind Slabs

Reactive wind slab, 20-30cm deep predominately on exposed alpine and treeline features. Human triggering possible.
Be careful with wind loaded pockets while approaching and climbing ice routes.Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2