Lots of uncertainty in the snowfall forecast for Tuesday and Wednesday. Danger ratings reflect forecast intense snowfall.
Summary
Confidence
Low - Forecast snowfall amounts are uncertain
Weather Forecast
TUESDAY: Cloudy with snow. One senior meteorologist is predicting a 'Fernie effect', which could bring up to 50 cm of dry snow in quick order late in the day. Light to moderate winds. Alpine temperature near -6.WEDNESDAY: Light winds. Light snow. Alpine temperature near -10.THURSDAY: Light winds. Moderate snow. Alpine temperature near -10.
Avalanche Summary
Explosives triggered several size 1.5-2.5 storm slabs on Monday morning. Skiers were also triggering loose dry avalanches which were gathering mass and running up to size 2. Reports of persistent slabs being triggered by people, machines and even remotely (from a distance) continue to come in, particularly at and below treeline. Check out the reports on the Mountain Information Network
here. On Thursday, a skier-triggered size 2 slab on a north-east aspect at 1975 m near Fernie caught and partially buried four people. Check out the details
here. Touchy avalanche conditions will continue as new snow continues to stress weaknesses in the snowpack.
Snowpack Summary
New snow is building storm slabs. Old and new wind slabs and cornices can be found at ridge top. If intense snowfall rates occur, loose snow avalanches are likely to run fast and far. A very touchy weak layer from mid-December (predominantly feathery surface hoar crystals and/or a sun crust) is found down about 40-90 cm. It is most prevalent at and below treeline, and seems particularly volatile between about 1600-1800 m. Deeper in the snowpack, an early season rain crust and sugary facets make up the picture. It is possible that a shallower avalanche could step down to these layers, creating a surprisingly large event.
pgoddard,
Avalanche Canada
