Regions
Northwest Inland.
For the safest, best skiing and riding, seek out low density new snow that hasn't formed a slab. Increase your caution at sheltered mid elevations where buried surface hoar may lurk.
Weather Forecast
Saturday: Mainly cloudy with scattered flurries bringing around 2 cm of new snow, continuing overnight. Moderate south winds. Alpine high temperatures to around -6.Sunday: Cloudy with continuing flurries bringing 3-5 cm of new snow decreasing overnight. Moderate to strong east winds. Alpine high temperatures to -8.Monday: Cloudy with continuing light flurries and a trace of new snow. Light southeast winds. Alpine high temperatures to around -8.
Avalanche Summary
Reports from Thursday included one observation of numerous natural storm slab releases from Size 1-2 north of Kispiox. These were noted running on relatively low angle terrain and suspected to have released over a layer of surface hoar that may not be widely distributed. Another few Size 2 natural storm slab releases were noted in very steep north aspects around treeline elevations in the Howsons.Wednesday's reports included observations of thin (5 cm) storm slabs becoming highly reactive to skier traffic in the Howson Range, producing small remotely triggered (from a distance) and sympathetically triggered (by an adjacent release) slides. These small slabs were also running naturally in any terrain over a 37 degree incline.
Snowpack Summary
Snowfall from the mid-week brought a variable 10-20 cm of new snow to the region. The new snow has buried a temperature crust that likely exists well into the alpine. There are also reports of more isolated pockets of surface hoar beneath the new snow at lower alpine and treeline elevations. This surface hoar is noted in our avalanche activity discussion for having produced numerous storm slab releases in a localized area after the storm ended. Below the new snow interface, deeper weak layers in the snowpack include a few crusts and surface hoar layers that formed in early January and December. Most recent reports suggest the snow is well bonded to these layers, but snowpack tests in the north of the region have shown some easy results with sudden fracture character, suggesting that a dangerous persistent slab problem may develop as the mid and upper snowpack consolidate into a stiffer slab.
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.