Avalog
Register
Get forecast notifications
Create an account to receive email notifications when forecasts are published.
Register
Login
Archived

Avalanche Forecast

Dec 17th, 2012–Dec 18th, 2012
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
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
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.

Weather Forecast

The weather is expected to be high clouds with sunny periods and no snow accumulations in the next few days.  A frontal system will pass South of Jasper on Wednesday and Thursday, while arctic air may arrive from the North in the forecast area bringing cooler temperatures by mid week.

Snowpack Summary

There is a variety of hard slabs and soft slabs on exposed ridge features and cross loaded gullies in the alpine and tree line.  A breakable 10cm wind slab does not propagate and is bonding well to the old snow surface. Below tree line, there is 10cm + of fresh snow over a supportive mid pack above 1900 meters in sheltered glades.

Avalanche Summary

No new avalanches have been observed since Monday Dec 10.  Wind slabs appear to have bonded well to the old snow surface. The raincrust laminate down in the lower 1/3 of snowpack is deteriorating into a FC layer and does not respond to a compression test.  Test results do show non planar collapses in the basal facets.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

A breakable 10cm + wind slab on an exposed ridge feature did not propagate and expand to an avalanche indicating that more recent wind slabs are still bonding well to the older snow surface.
Caution in lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3

Deep Persistent Slabs

The November rain crusts are deteriorating into a facet layer that is not responding to field tests at this time.
Avoid convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3