Avalanche Forecast
Regions: South Columbia.
Confidence
Fair - Freezing levels are uncertain on Monday
Weather Forecast
A significant storm system enters the region Saturday evening bringing 30 - 40 cm of new snow. This system exits the region Sunday as freezing levels climb to 1300 m. Average seasonal temperatures return Monday while a weak ridge of high pressure builds into the forecast area.
Avalanche Summary
Several skier triggered size 1 avalanches were reported yesterday as new snow was blown into soft slabs by strong NW winds. A natural cycle driven by the winds was reported from a few different locations. Avalanches from size 1 - 3 were reported.
Snowpack Summary
60 - 100 cm of storm snow has fallen in the last week across the province. While storm shears have been quick to heal, winds have had a dramatic effect on wind exposed terrain at all elevation bands. Soft slabs of 10 - 30 cm were reported Thursday as winds switched to the NW and blew at moderate to strong values.All the new snow is sitting on cold dry snow formed during last week's Arctic Outbreak. The cold dry air created a layer of facets that are being referred to as the Jan 20th, facets. A Rutschblock test in the north showed a result of RB6, MB down 90 on this layer. In the south a CTE test produced a failure down 70 at this interface.The January 13th SH/FC layer is spotty in distribution, but it is still capable of performing. Deep in the pack the mid December layer is gaining strength, but may still be an issue in areas of thin shallow snowpack.
Avalanche Problems
Wind Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Likely
Expected Size: 1 - 4
Cornices
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood: Likely
Expected Size: 2 - 6
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Likely
Expected Size: 2 - 6