Northwest Coastal

Good

Synopsis: A ridge of high pressure will maintain mostly sunny skies for the next few days. Wednesday and Thursday: The freezing level should rise to around 1000-1200 m during the day and drop back to valley bottom overnight. Outflow winds should ease off by Wednesday and we should generally see light winds from the north. Friday: Freezing levels could climb to 2000 m during the day on Friday.

Recent reports include a few small natural wind slabs in steep lee terrain in response to northerly outflow winds. A few natural cornice failures, ice falls, and glide slab releases have also been reported. One cornice fall observed just north of Terrace triggered a size 3 slab avalanche that is suspected to have released on the late February weak layer. This event could have been a few days old.

Outflow winds (from the north and east) have create new hard and soft wind slabs in exposed lee terrain. In sheltered areas the snow surface consists of facets, surface hoar, or a sun crust/ moist snow on south facing slopes. A layer of surface hoar, facets and/or a crust is buried down 50-90 cm, but most operators report a good bond at this interface. Watch out for cornices, as they are large and fragile. Several large cornice falls have been reported over the past few days. Most have not triggered slabs on the slopes below, however at least one triggered a very large avalanche. The mid snowpack layers are generally well settled and strong. Facets at the base of the snowpack have resurfaced as a concern now that spring is on the doorstep and full-depth releases are becoming more likely (primarily in the northern part of the region).