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Archived

Avalanche Forecast

Dec 14th, 2011–Dec 15th, 2011
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
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
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: Northwest Inland.

Confidence

Fair - Intensity of incoming weather is uncertain on Friday

Weather Forecast

Thursday: Cloudy. Light snow accumulations beginning late in the evening. Freezing levels remain at valley bottom. Friday: Snow amounts up to 10cm. Freezing levels remain in the valley. Winds will be strong from the south west. Saturday: Cloudy with flurries during the day.

Avalanche Summary

No recent avalanche activity has been reported. I suspect we will see a natural cycle through the early part of the weekend with more snow and wind forecast. If you see any avalanche activity, or have made field observations please feel free to send them our way. Write to us at [email protected].

Snowpack Summary

Up to 20cm new snow has fallen on a variety of snow surfaces including surface hoar, melt-freeze crusts and facetted snow. For the most part all aspects between 900m-2000m have a hard melt freeze crust. This crust is widespread and is lingering in most start zones. This may be a suspect layer of concern as when future storms with significant snow and wind arrive. Above this crust surface hoar (feathery crystals) and facets (sugary crystals) are forming. This exists at treeline and below treeline elevations. The recent winds in the alpine have destroyed the surface hoar eliminating one problem but creating a wind slab problem. These wind slabs are in the immediate lee of features, with easy shears and cracking being reported. The midpack seems to be well settled and strong. Thanks to those who have sent in field observations. If you have any info from the field, we would love to hear from you. Write to us at [email protected]

Avalanche Problems

Wind Slabs

Expect new wind slabs on northeasterly aspects. Loading may occur lower on the slopes due to forecast high winds in some parts of the region.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3