The forecast for last Saturday showed a very nice wave system due to strong north-west wind blowing above the Jura. Although, we had snow fall during the morning in Yverdon airfield, we decided to rig 2 sailplanes and give a try. After very short towing (5min), we already hit strong lift and it was time to release. Then, the magic occurred and we were able to climb up to 4000m, thank to the ATC clearance given by the Geneva controller. See below the video and images to get a feel of it… the only thing you will not get is the cold… I was frozen at -18deg in my glider but this is a small detail:-)