During 60+ years of watchingg the skies I thought I'd seen most things but a contrail this morning had me puzzled. There was a stable anticyclone over the UK and contrails from many other aircraft at the time were "straight and true" until they dissipated. However, one commercial B747-400 produced a very distorted trail as it flew westbound over Woodley at around FL360. Piccy here:
Contrail from commercial B744 in stable air on 19 Jan 2011. All other trails at the time were straight. :: Contrail-19_1_11.jpg :: Fotopic.Net
At about the same time, an eastbound flight produced a normal trail. Any clues anyone?