The motion of two vortices in a liquid was investigated photographically and it was clearly shown that there is a tendency to approach of two vortices with the same sense of rotation and to separate of those with the opposite senses
FUJIWHARA, S. (1931). Short note on the behavior of two vortices. Proceedings of the Physico-Mathematical Society of Japan. 3rd Series, 13(3), 106-110.
https://t.co/SV8s6TcTHn https://t.co/yu3cd17IaX
@KathrynProciv @gdimeweather @TWCErikaNavarro Yes, not just tropical cyclones -- in fact this set of photos from Fujiwhara in 1931 https://t.co/cnljRqGBoK was of vortices in water https://t.co/U9EOPzZ1yj