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Archived

Avalanche Forecast

Feb 11th, 2013–Feb 12th, 2013
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
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.

Tuesday's avalanche danger will increase if the forecasted frontal passage comes in Monday night instead of Tuesday night.

Weather Forecast

Up to 20cm of snow could fall as a front passes through the area beginning later in the day on Tuesday and continuing through to Wednesday mid day. Temperatures will drop by a few degrees overnight as the front passes and a trailing cold front settles into the area.

Snowpack Summary

Hard windslab is bridging the weak basal facets above treeline.  Field tests in the alpine on a SE windloaded terrain feature produced easy results on a buried surface hoar layer directly below the hardslab. This confirms that there are several weak layers below that the avalanche can slide on.  Below treeline, the mid-pack is weak.

Avalanche Summary

No new avalanches were observed today.

Confidence

Forecast snowfall amounts are uncertain on Tuesday

Avalanche Problems

Wind Slabs

Up to 10cm of snow from recent flurries has been redistributed by moderate NW winds onto the Southeast aspect of terrain features. This soft slab could knock a person over in steeper terrain.
Be careful with wind loaded pockets while approaching and climbing ice routes.Use ridges or ribs to avoid pockets of wind loaded snow.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The hard windslabs that dominate the alpine snowpack have been unreactive lately. It still may be possible to trigger an avalanche on steep unsupported terrain from thin areas and  the edges of these slabs.
Be aware of thin areas that may propogate to deeper instabilites.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 1 - 3