Sky was cloudy most of the day. But at about 12:30 P.M., the sun came out blazing, and within five minutes almost everything changed. There was a wave of rollerballs tumbling down a steep south-facing slope at about 8.600'. Rime started dropping from the trees, changing the creamy powder in the aspens to an icy, pockmarked surface, and this was on north-facing. The sun went away pretty quickly, but the damage was done. The next lap down, all the fluff was now heavy. Stayed cloudy the rest of the afternoon, but we found snow had heavied up on all aspects. This despite the weather station at Skyline showing a high temperature for the day of 30.7, around 1:30 P.M. Light wind from the WSW all day.