Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Regions
Kootenay Boundary.
The new snow will take time to settle and bond to a prominent crust. Dial back your terrain choices until conditions stabilize. Due to limited data it is CRITICAL to supplement this information with your own observations.
Confidence
Moderate - Timing, track, or intensity of incoming weather system is uncertain
Weather Forecast
We're looking at a brief lull in the active weather pattern on Wednesday, before the next system arrives on Thursday with modest amounts of snow.WEDNESDAY: Clearing throughout the day. Moderate westerly ridgetop winds. Freezing level around 1200 m.THURSDAY: Snow (10-15 cm). Moderate southwesterly ridgetop winds. Freezing level around 1000 m. FRIDAY: Cloudy with sunny breaks during the day and isolated flurries. Moderate south west ridgetop winds. Freezing level around 1000 m.
Avalanche Summary
On Monday we had reports of a natural Size 2 avalanche near Kootenay Pass. See here for the MIN report, along with some good snowpack information. We currently have very limited observations in this region. Please submit your observations to the Mountain Information Network (MIN).
Snowpack Summary
Anywhere from 2-10 cm of snow fell Sunday overnight into Monday, as temperatures dropped by 5-10 degrees (and back to more seasonal values). Ridge top winds were moderate from the west and likely formed wind slabs on lee (easterly) slopes.This new snow fell on a 2 cm thick melt-feeze crust (the November 27th crust), which could become a good sliding layer during Tuesday's storm.The depth of the snowpack varies greatly with elevation. Recent reports suggest the average depth is 100-170cm in the alpine, 50-100cm at treeline, and decreasing rapidly below treeline where the primary hazards are rocks, stumps, and open creeks. Last week's heavy rain to the mountaintops really shrunk the snowpack and has transitioned much of the snowpack from dry to moist snow. We currently have very limited snowpack observations within this region and it is critical to supplement this information with your own observations.
Problems
Storm Slabs
Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.