Can a contrail create a line of cumulus clouds? See the weather satellite visible imagery from this afternoon: http://cpacker.org/misc/xvis1.png The radar image of about the same time shows precipitation along parts of it: http://cpacker.org/misc/xrad.png I watched the radar and for the next two hours the line drifted slowly southeastward and intensified, with several areas developing into rainstorms. Is it possible that this was an experiment in cloud seeding? #science