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Archived

Avalanche Forecast

Dec 5th, 2017–Dec 6th, 2017
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
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Good skiing exists in sheltered areas near treeline. Thursday may have freezing levels rising to 3400m which is unusual for this time of year. Expect the danger to increase with unseasonably warm temperatures.

Weather Forecast

Wednesday will be mainly sunny, no new snow, high of 1 degree, 10-20km/hr NW winds, and 2100m freezing level. Thursday will be sunny, alpine temperature of 4 degrees, light NW winds, and 3400m freezing level. This spike in freezing level is unusual for this time year. Friday will be sunny, light West winds, and 2200m freezing level.

Snowpack Summary

Wind slabs are in exposed lee features. A significant crust (Black Friday, Nov.23) can be found down 30 to 70cms. A persistent slab overlays this crust and so far the bond appears to be strengthening at this interface. The Halloween crust sits well down in the snowpack at TL locations and as high as 2700m.

Avalanche Summary

No patrol on Tuesday and nothing new reported. No new avalanches noted on Monday.

Confidence

The weather pattern is stable on Wednesday

Avalanche Problems

Wind Slabs

Wind slabs are present on lee aspects. Bond strength of these slabs to the snowpack below is uncertain.
Use caution in lee areas. Recent wind loading has created wind slabs.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3