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Archived

Avalanche Forecast

Jan 12th, 2012–Jan 13th, 2012
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
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
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

Regions: Northwest Coastal.

Confidence

Fair - Intensity of incoming weather is uncertain on Friday

Weather Forecast

Thursday night/ Friday: 15cm of snow / Moderate to strong southwest winds / -12.0 at 1500mSaturday: Light snowfall / Moderate northerly wind / -12.0 @ 1500mSunday: Clear skies / Light northerly winds / -18.0 @ 1500m

Avalanche Summary

Several size 1's reported on wednesday in the top 10cm in wind affected areas. Expect significant wind slab activity with forecast snow and wind on thursday night.

Snowpack Summary

Some areas (Terrace, Kaziks) are reporting an alpine snowpack of 5 metres. In these areas the mid-december surface hoar-facet layer is buried down about 250 cm and has not been reactive for quite some time. At this time the biggest issue in the region seems to be new snow instabilities. Although they can be quicker to heal than other weaknesses, they may be highly destructive, especially with this season's pattern of heavy accumulations of snow combined with strong winds.Areas that experienced very strong winds during the recent storm may have thick windslabs that may take another couple of days to settle. Be cautious of large, recently developed cornices. They may be destructive by themselves, or they can become a trigger for an avalanche on the slope below.The mid and lower snowpack is generally well settled and strong.Expect significant new wind slab development with forecast wind and snow.

Avalanche Problems

Storm Slabs

Thursday's snowfall will add to a layer of recent storm snow that may take a couple of days to bond to the old surface.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

Expect widespread windslabs on lee features at treeline and in the alpine in the wake of thursday night`s snowfall

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 5