Slab overtop buried surface hoar is producing less frequent but larger avalanches at lower elevations and wind slabs are the main concern up high.
Summary
Weather Forecast
Westerly flow bringing light amounts of snow today. Pacific frontal system arriving to the regionĀ this evening, expecting moderate amounts overnight with associated strong west winds. Lingering flurries on Monday and dry conditions are forecast for Tuesday.
Snowpack Summary
Top 30cm low density snow. Localized Feb 15 drizzle crust down 20-30cm. Feb 12 surface hoar(SH)/crust layer is down 40-50cm. Fracture line profile on size 2.0 avalanche, Mt Fidelity, showed the Feb 12 bed surface layer as SH size 3-7 on a 3cm crust. Moderate sudden planar compression test results and a Rutschblock 3 whole block on that layer.
Avalanche Summary
From yesterday: 5 natural slab avalanches ranging in size 2 to 2.5 east of the Rogers Pass summit.From Feb 22: Skier controlled size 2.0 slab avalanche on Mt-Fidelity, 33-40deg, south aspect, down 35-45cm, 1700m, 100m wide, 120m long
Confidence
Due to the number of field observations on Sunday