Regions
Northwest Coastal.
Confidence
Poor - Timing, track, or intensity of incoming weather is uncertain for the entire period
Weather Forecast
A series of frontal disturbances will affect the region over the next few days. The timing and intensity of these systems is uncertain. Freezing levels are also uncertain.Monday: Light to moderate precipitation. Moderate southerly winds. Freezing level around 1400 m. Tuesday: Cloud and light precipitation. Light winds. Freezing level around 1000 m. Wednesday: Light to moderate precipitation is possible, with moderate SW winds.
Avalanche Summary
Several natural glide avalanches were reported this week, in the size 2-3.5 range. Wet loose avalanches up to size 2.5 were also observed in response to warming from rainfall and sunshine.
Snowpack Summary
Glide cracks have opened up and pose the threat of large, full-depth releases, especially on steep rocky terrain features at low elevations. Large cornices and ice cliffs pose a threat from above. At this time of year, snowpack stability tends to decrease during times of warming (e.g. on slopes receiving sunshine, during rainfall, in the afternoon and at low elevations) and improve when the surface is frozen. Lately, a lack of consistent overnight freezing has left the snowpack weak and unconsolidated, although some re-freezing has been reported in some areas.
Problems
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.
Wet Slabs
Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.
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.