A brilliantly sunny day and a mechanical digger works hard on Golf (that's the blue run down from our building, Aime 200 which is just visible in the niche between the covered car pack and Haut Bois). It seemed to be smoothing earth around newly installed artificial snow blowers. However the amazing thing in the video for me is the slowly developing and constantly changing wall of low (2,000 - 3,5000m?) cloud in the notch to the left of Grand Combin in the far distance. By the end of the day it had spread to the lower reaches of Mont Blanc. What causes that and lasts all day?