An additional 30-40 cm of snow on Wednesday will revitalize the storm slab hazard.
Periods of rapid loading has formed a widespread storm slab. Another strong storm on Wednesday will stress the snowpack and make human triggering likely in spots.
Avalanche control using explosives in the highway corridor produced size 2-3 avalanches on Monday evening.
There was also evidence of a widespread natural avalanche cycle (also size 2-3 ) on all aspects in the Rogers Pass backcountry.
Approximately 50-70 cm has fallen over the past week with periods of heavy loading and strong wind on Monday evening. An additional 30-40 cm is forecast for Wednesday. All this new snow needs time to settle.
Areas sheltered from the wind may have a layer of surface hoar buried around 80cm deep.
Storming with heavy snowfall on Wed and gusty winds.
Tonight Snow, 16cm. Wind SW 40 km/h, FZL (freezing level) 900m..
Wed Heavy snow 36cm, Wind west 20 gusting to 60km/h, alpine high -2°C FZL 1700m.
Thurs Flurries, 9cm. Winds 20 gusting 60, FZL 1500m.
Fri Flurries, 7cm. Wind W 20 gusting 45. FZL 1000m.
