Regions
Northwest Inland.
Watch for wind slabs in lee features at higher elevations. Use caution if wet snow is found at low elevations, especially if the sun comes out for any length of time.
Confidence
Moderate - Timing or intensity of solar radiation is uncertain on Sunday
Weather Forecast
Not much change in the weather pattern: A mix of sun and increasing cloud and little if any precipitation until Tuesday.SUNDAY: Partly cloudy / Light northerly winds / Alpine temperature 0 degrees C / Freezing level 1400 m.MONDAY: Cloudy with isolated flurries / Light to moderate north westerly winds / Alpine temperature near 0 degrees C / Freezing level 1300 m.TUESDAY: Scattered flurries (5 cm possible) / Moderate south westerly winds / Alpine temperature near -1 C / Freezing level 700 m.
Avalanche Summary
On Friday, wet loose avalanches to size 2 were reported at all elevations on sunny aspects. Some of these stepped down to basal facets in northern parts of the region. In the south of the region, cornice failures on north facing ridge lines in the alpine were also reported, to size 2, but not triggering slabs below.
Snowpack Summary
Variable snow surfaces are found in the region. In the east of the region, 5 to 10 cm of snow fell late last week onto a melt-freeze crust from previous warm temperatures and rain. In the west of the region, the melt-freeze crust is on the surface. Wet snow may still exist at low elevations on all aspects. High elevation north aspects may have lingering wind slabs in immediate lee features. This overlies a surface hoar and sugary facet layer in sheltered locations.A surface hoar and crust layer from January is buried around 80 to 140 cm in the southwest of the region. This layer still has the potential to be triggered from a thin snowpack spot, or with a large trigger like a cornice fall.Sugary facets exist at the bottom of the snowpack in steep, rocky, and shallow snowpack areas.
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.