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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
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
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: South Coast.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Sunday: Northwest flows aloft will bring continued snowfall accumulations. Snow amounts 5-10 cm accompanied by moderate ridgetop winds from the West. Alpine temperatures near -6.0 and freezing levels at valley bottom. Monday: A low pressure system over Gulf of Alaska will move onto the north coast, sliding South bringing light precipitation. Snow amounts near 5cm with moderate NW ridgetop winds. Alpine temperatures near -6 and freezing levels at valley bottom. Tuesday: Light-Moderate snowfall amounts expected. Alpine temperatures near -3.0. Ridgetop winds  out of the NW in the light ranges.

Avalanche Summary

No new avalanche observations reported.

Snowpack Summary

Around 15 cm of snow overlies a variety of surfaces including hard old wind slabs, thin and thick crusts and large surface hoar crystals which can be found in sheltered terrain below treeline. In some areas, winds have transported the new snow and has built winds slabs in the lee of terrain features. A surface hoar layer buried down 40-80 cm seems to be gaining strength, but still exhibits moderate, sudden results in isolated snowpack tests. Near the base of the snowpack, a crust/facet layer exists, which is now unlikely to be triggered, except perhaps by heavy triggers in unsupported, shallow, rocky terrain where more faceting has taken place.

Avalanche Problems

Storm Slabs

Storm slabs have built, and in areas affected by wind, wind slabs are likely encountered. These continue to be touchy to rider triggers. In other areas be alert for loose dry avalanches out of steeper terrain.
Avoid freshly wind loaded features.>Use ridges or ribs to avoid pockets of wind loaded snow.>Be cautious of sluffing in steep terrain; especially in areas where terrain traps lurk below.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 4