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Archived

Avalanche Forecast

Jan 24th, 2013–Jan 25th, 2013
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
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
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: Glacier.

Minimize exposure to overhead avalanche terrain, large avalanches may reach run out zones.

Weather Forecast

Flurries are forecast for today with moderate westerly ridge top winds and max air temp= -5.  A frontal system will restart the snow this evening into Friday, we expect moderate amounts of snow up to 15 cm.  Temperature will remain seasonal.  Saturday, drier conditions return.

Snowpack Summary

20 to 30 cm of new snow has covered a variety of surfaces including, small surface hoar and sun crust on steep south through west slopes. This also covers widespread wind effect in open areas at treeline and in the alpine.Jan 4th SH/CR down 65-95 cm reacting in stab tests (moderate to hard range) in isolated location most recently at TL, SE asp.

Avalanche Summary

No new avalanches were observed in the park yesterday, visibility was poor.� We expect small, loose natural avalanche where happening Wednesday evening through the overnight period due to new snow and moderate winds in the alpine.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

30cm of new snow has created storm slabs. These can be triggered by riders especially in steep terrain. Watch for wind effected snow on north/northeast slopes in open areas at treeline and in the alpine. Snow will be sluffing in steep treed terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

A weak layer down around 65-90 cm might still be reactive to skier triggering. No natural avalanches have been observed on this layer recently. New snow overnight may overload this layer, causing it to fail with the additional weight of a rider.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3