Regions
South Coast Inland.
This forecast is based on limited information. Snow amounts are also uncertain. Treat this as a first estimation of avalanche danger and be prepared to adjust your decisions based on observed conditions.
Confidence
Low - Intensity of incoming weather systems is uncertain
Weather Forecast
Allison Pass (1340m):32mm on Sunday. Rain becomming snow 10pm Sunday with approx 5cm snow at end of storm.Coquihalla Summit (1230m):25mm precip Sunday. Temps becoming negative at 4pm. Suspect about 10cm new snow.Little Bear (1660m): 20cm snow at end of storm overnight stopping 5am this morning.Great Bear (1710m): Winds 20-30 SW to SE during storm, diminishing to 10 SECayoosh Summit (1350m):30mm Rain on Sunday with 2cm snow at end of storm.Blowdown Mid (1890m):32mm precip/8cm snow; TPres -7Blowdown Peak (2320m): During storm 30-50 S and SW; Recent 20-25 W
Avalanche Summary
There was a natural avalanche cycle on Sunday. On Monday no activity was reported. On Tuesday, I'm expecting mostly small wind slab avalanches in exposed terrain.
Snowpack Summary
Recent heavy rain saturated the upper snowpack at all elevations before depositing 10-20 cm of new snow at higher elevations on Sunday morning. Below any new snow accumulations, the previously rain-soaked upper snow has formed a crust, reported to be thick (15 cm) below treeline and thin (2cm) in the alpine. Treeline snow depths are approximately 90 cm throughout 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.