The weak layer that failed at 5500' was present from 3500-5500+'. At altitudes below 5,000' the snow layer above the weak layer was much more firm. The weak layer became less reactive at lower altitudes but it seemed to be present everywhere and on all aspects. It looked like hoar frost. This was the first 35 degree slope above 5,000 feet on the climbing route. The area that failed is my usual safe, isolated test slope. It failed spontaneously as I approached it. Other much larger 35 degree slopes are not avoidable on the climbing route, so I turned around and went home (thus, I have no observations at higher altitudes). Temperatures were in the teens and west winds of 25 mph above 5,000 feet were still moving a lot of snow around. I suspect that the depth of snow over the weak layer continued to increase with altitude, especially on lee south and east slopes.
Snow in this week's storms accumulated 2-3" at Marble Mountain deepening to 2 feet by 4,000' and perhaps more by 5,000'. Clouds were protecting slopes below 5,000' from the sun today but some large rollers and small loose wet avalanches from yesterday were apparent below 4500'. Above 5,000' teh sun was out a lot but temps were in the mid teens with winds up to 25 mph.