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Archived

Avalanche Forecast

Jan 10th, 2014–Jan 11th, 2014
Alpine
4: High
The avalanche danger rating in the alpine will be high
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
4: High
The avalanche danger rating in the alpine will be high
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Watch for local accumulations and building avalanche danger over the weekend.

Weather Forecast

Heavy snow fall warning in effect for Jasper. Mild temperatures and up to 20cms new snow are expected through Sunday.

Snowpack Summary

Additional mass added to the already weak snowpack will likely result in heightened avalanche danger this weekend.  In the alpine storm and winds slabs are found and test with easy to moderate shears.  Near treeline the midpack is supportive and untracked powder can be found in wind sheltered locations.

Avalanche Summary

Increased loading with new snow and wind forecast for the weekend will renew avalanche activity.  Field teams noted debris of 2 sz 2.5 slab avalanches which had released in the last 48 hours on the basal facets at alpine elevations. Control work with large explosives produced avalanches to size 2 below on Thursday.

Confidence

Forecast snowfall amounts are uncertain

Avalanche Problems

Deep Persistent Slabs

New snow will likely overload deep weaknesses in the snowpack causing increased avalanche activity.
Avoid steep, open slopes.Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Wind Slabs

Alpine and tree line winds had added a stiff wind slab to the weak snowpack. If this layer triggers it will likely step down to the basal weakness mentioned above.
Avoid freshly wind loaded features.Avoid ice climbs that are in terrain traps below large start zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2