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Archived

Avalanche Forecast

Jan 14th, 2014–Jan 15th, 2014
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Northwest Inland.

Confidence

Good

Weather Forecast

Tonight and Wednesday:  The cold front move SE of the region tonight. Precipitation will ease, extreme winds should remain strong from the NW, freezing levels lower to around 600 m by tomorrow morning. Thursday: A ridge of high pressure is well in place. Continuing rising freezing levels climbing to 1700 m on Friday. Strong SW winds are forecasted. Friday overlook: Ridge is still dominating the pattern with clear skies and warm temperatures.

Avalanche Summary

Yesterday, there was reports of natural storm snow avalanches releasing in wind loaded features from the west of the region.

Snowpack Summary

The recent wind event and forecasted strong winds from the NW will continue developping windslabs in the alpine and at treeline. Lee alpine slopes and open treeline areas will remain touchy tomorrow. Solar radiation on steep S facing slopes could also weaken the snowpack and cornices which could trigger fresh slabs.Up to 60 to 75cm cm of low density snow now overlies heavily wind-affected surfaces and well developed surface hoar or crust in sheltered areas mid-treeline and below. The mid and lower snowpack are found to be generally gaining strength with depth until the bottom 20-40cm where weak faceted crystals exist down to the ground. The fluctuating freezing levels created a crust at lower elevations.

Avalanche Problems

Storm Slabs

Watch for increased reactivity in wind-exposed terrain especially if sun comes out and hits steep windloaded features.
Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>Avoid lee and cross-loaded terrain near ridge crests.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Persistent Slabs

Avoid thin spots, cross-loaded slopes or unsupported terrain.
Be aware of the potential for full depth avalanches due to deeply buried weak layers.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 5