Avalanche Forecast
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.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use increased caution in lee areas. Recent snowfall and wind loading have created wind slabs.
- The new snow will require several days to settle and stabilize.
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.
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 SE
Cayoosh Summit (1350m):30mm Rain on Sunday with 2cm snow at end of storm.
Blowdown Mid (1890m):32mm precip/8cm snow; TPres -7
Blowdown Peak (2320m): During storm 30-50 S and SW; Recent 20-25 W
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Wind slab avalanches are expected to form in response to loading from new snow and wind. The new snow may not bond well to the underlying crust.