The image shows winds measured by Aeolus over western Europe on 10 March 2019. Red indicates wind blowing from east to west (easterlies) and blue indicates wind blowing from west to east (westerlies). The strong westerly wind in the jet stream, with speeds of more than 200 km per hour, is clearly visible at the altitude of around 10 km. On this day, very strong winds extended from the jet stream all the way down to the surface and caused problems for traffic and construction, for example. Black areas indicate where the satellite could not measure winds owing to thick cloud layers.