Regions
Kootenay Boundary.
Shady slopes offer the best snow. Isolated wind slabs may exist at high elevations.
Confidence
High - The weather pattern is stable
Weather Forecast
MONDAY: Clear skies with valley clouds, light westerly winds, freezing level around 3600 m with below-freezing temperatures in the valleys.TUESDAY: Mostly clear skies with valley clouds, light to moderate westerly winds, freezing level dropping to 2500 m with below-freezing temperatures in the valleys.WEDNESDAY: Partly cloudy with valley clouds, light northwesterly winds, freezing level around 2500 m with below-freezing temperatures in the valleys.
Avalanche Summary
Small loose dry avalanches were observed from skier traffic in steep terrain on Saturday. Small wind slabs were released on Friday by a skier and explosives in alpine lee features. Small loose wet avalanches were observed on steep south-facing slopes on Thursday.
Snowpack Summary
Moderate winds from the west and northwest may have formed wind slabs in southerly and easterly lee features. These may sit above lingering slabs from last week. The warm air temperatures and clear skies from the past few days have caused melting of the surface snow on south-facing slopes near treeline and above. Crusts may form overnight but should melt quickly in the mornings if clear skies prevail. Dry snow is generally found on shady slopes and below treeline, which may produce sluffing in steep terrain. Surface hoar to 30 mm has been observed along with near-surface faceting in the top 20 cm of the snowpack. Beneath this, the snowpack has settled and may be improving the bond to the 30-50 cm deep rain crust from late November. However, there are still limited observations of this crust layer. On ridges, cornices may be weakening with the warm air temperatures.
Problems
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.
Loose Wet
Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.