Regions
Northwest Coastal.
Watch for wind slabs in unusual places, including low elevation terrain.
Confidence
High - The weather pattern is stable
Weather Forecast
SATURDAY: Dry and sunny, moderate winds from the east, treeline temperatures around -10 C.SUNDAY: Dry with a mix of sun and cloud, moderate winds from the southeast, treeline temperatures around -10 C.MONDAY: Mostly cloudy, moderate winds from the northwest, treeline temperatures around -12 C.
Avalanche Summary
On Thursday, skiers triggered a few small slabs (size 1) on steep wind-loaded features. Earlier in the week, explosive control work in the northern parts of the region managed to produce some large avalanches that failed on the late October crust on north through east aspect alpine slopes.
Snowpack Summary
The region picked up 20 to 60 cm of storm snow last weekend accompanied by winds out of the southwest, west, northwest, and most recently the east. Since then, little additional snow has fallen, but cooler temperatures have kept snow dry and susceptible to being blown around by the wind. Wind slabs may rest on a melt-freeze crust (reported to be 3 to 15 cm thick), and there are reports of surface hoar resting above this crust in sheltered locations. Below this crust the mid-pack is reported to be generally strong. You can expect to find a second prominent crust, which was buried at the end of October, 100 to 200 cm below the surface. This lower layer may have associated facets, particularly in shallow locations around Stewart and the northern parts of the region.
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.