Avalanche Forecast
Regions: South Columbia.
Confidence
Fair - Freezing levels are uncertain on Monday
Weather Forecast
Saturday: Mix of sun and clouds with possible flurries. Light north winds. Freezing level 1600m.Sunday: Mostly clear and sunny. Light northwest winds. Freezing level 1500m.Monday: Mix of sun and cloud. Light west winds. Freezing level 2400m with a possible temperature inversion.
Avalanche Summary
Recent reports on are limited to loose wet avalanches on solar aspects size 1-2.
Snowpack Summary
Warm temperatures resulted in the freezing level reaching to almost 2500m early this week. This has helped to settle out last weeks storm snow, it's reported to be bonding well to the old surface. Strong winds out of both the SW and NW have redistributed what little dry snow still exists at upper elevations into wind slabs immediately lee of ridge crest.Three persistent weak layers exist in the highly variable snowpack of the South Columbia's:The mid-March sun crust/surface hoar layer down 50-80cm seams to have gone dormant for the time being.The early-March crust/facet/surface hoar layer down around 80-120cm has become less susceptible to human triggering, but still has the capacity to produce large avalanches.The mid-February crust/facet/surface hoar combo is typically down 150 - 200cm. Direct triggering of this layer has become unlikely, however, cornice fall, a smaller avalanche in motion or prolonged warming could wake this layer up, which would result in very large and destructive avalanches.
Avalanche Problems
Wind Slabs
Aspects: North, North East, East, South East, South, South West.
Elevations: Alpine.
Likelihood: Possible - Likely
Expected Size: 1 - 3
Deep Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Unlikely - Possible
Expected Size: 4 - 8