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Archived

Avalanche Forecast

Dec 7th, 2014–Dec 8th, 2014
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
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Jasper.

A storm is approaching and is forecast to hit the region on tuesday and intensify into Wednesday.  Conditions will deteriorate rapidly. 

Weather Forecast

Snow will begin Monday evening becoming heavy by Wednesday with accumulations of 30 cm possible.  Winds will increase into the moderate range.  Temperatures will be warm with the freezing level reaching to 2200 m on Wednesday.  Precipitation will likely fall as rain at lower elevations.

Snowpack Summary

Warm temps are reaching into the alpine and are promoting settlement of last week's storm snow.  Isolated windslab can be found in exposed areas in the alpine. The main concern is the interface between the settled storm snow and several crusts near the bottom of the snowpack. This interface is producing widespread whumphing at treeline.

Avalanche Summary

No field patrols today.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Avalanche Problems

Persistent Slabs

Storm snow has evolved into a persistent slab mainly around treeline and sheltered alpine slopes. Widespread whumphing in open treeline areas.  Propagation from  whumphing is possible on steep unsupported slopes.
Assess start zones carefully and use safe travel techniques.Carefully evaluate and use caution around thin snowpack areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Wind Slabs

These slabs are found on exposed slopes and produced moderate to hard test results with failures in the facet layer near the bottom of the snowpack.
Use caution in lee areas. Recent wind loading have created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3