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Avalanche Forecast

Feb 11th, 2014–Feb 12th, 2014
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
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

Regions: South Columbia.

Snowfall amounts may vary dramatically across the region. The hazard may change dependent on the amount of new snow. More snow than forecast may push the hazard rating higher than forecast.

Confidence

Fair - Forecast snowfall amounts are uncertain

Weather Forecast

Synopsis: A series of Pacific lows will bring moisture into BC for the next 5 to 7 days.Tuesday night: Freezing level at valley bottom, Precipitation should begin again this evening and into the morning as another wave of moisture moves into the Province. Expect moderate to locally heavy amounts of precipitation, with strong winds at ridge tops.Wednesday: Freezing Level: 1200m; with light to locally moderate amounts of precipitation. Moderate to strong winds at ridge tops.Thursday: Freezing levels may rise to 1300m with light precipitation and a small break between waves of Pacific moisture. Moderate to strong winds at ridge top.Friday: Another wave of Pacific moisture. Moderate to locally heavy precipitation, freezing level may go up to 1100m during the day, moderate to strong south west winds at ridge tops.

Avalanche Summary

Numerous reports of size 1 to 1.5 natural and skier controlled avalanched have been reported in the past 24 hr. Expect the size and numbers to increase in the coming days..

Snowpack Summary

The new snow has fallen on a variety of weak surfaces that include surface hoar (widespread in most sheltered and shaded areas at all elevations), facetted wind slabs from the recent cold clear arctic conditions, and sun crust on some steep south facing slopes. These weak layers will be problematic for the near future. It will take time for the new snow to bond with these old surfaces. Forecast strong winds at ridge tops will redistribute the new snow and form wind slabs on lee slopes. A facet/crust weakness near the bottom of the snowpack has gone dormant for the most part, but we're still seeing an avalanche that goes deep every few days. The depth of this layer makes triggering an avalanche unlikely but the consequences would be very serious.

Avalanche Problems

Storm Slabs

Facets, crusts and surface hoar reported throughout the forecast area are now being buried by incoming storms. Careful attention to these layers will be necessary for safe back country travel. Special attention should be given to wind loaded slopes.
Avoid steep, open glades in the forest.>Avoid shallow snowpack areas where triggering is more likely.>Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 4