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Archived

Avalanche Forecast

Jan 26th, 2013–Jan 27th, 2013
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
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: Glacier.

Make conservative terrain choices today. As you increase your exposure to avalanche terrain, do it gradually as you gather information.

Weather Forecast

Flurries are forecast for today with freezing levels rising to 900m.  Ridge top winds will be light from the west and alpine temps around -6.  Light snow is expected to continue Sunday with slightly cooler temperatures.  The outlook for Monday is moderate precipitation amounts.

Snowpack Summary

30 to 45 cm of new snow remain unconsolidated below treeline.  Moderate southerly winds loaded northerly aspects during the storm. This snow covered a variety of surfaces including, small surface hoar and sun crust on steep S through W aspects.  Yesterday this interface was not failing in stability tests at treeline in the Hermit basin, SE aspect.

Avalanche Summary

We have observed two moderate natural avalanche cycles involving the storm snow on both Friday and Saturday morning. Many paths along the highway corridor ran size 2-2.5, with a few size 3. Deposits were reaching the end of run outs in some events. We suspect similar avalanches were occurring up all the backcountry drainages.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Avalanche Problems

Storm Slabs

45cm of new snow has created storm slabs. These can be triggered by riders especially in steep, unsupported terrain. Watch for wind effected snow on north/northeast aspects at treeline and in the alpine. Be cautious of sluffing in steep terrain.
Choose conservative lines and watch for clues of instability.Stay off recent wind loaded areas until the slope has had a chance to stabilize.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2