Back Efed Fujiwara Breton Fujiwhara-Effekt German Efecto Fujiwhara Spanish اثر فوجیوارا Persian Effet Fujiwara French फुजिवारा प्रभाव Hindi Efek Fujiwara ID 藤原の効果 Japanese 후지와라 효과 Korean Fujiwara-effect Dutch
The Fujiwhara effect, sometimes referred to as the Fujiwara effect, Fujiw(h)ara interaction or binary interaction, is a phenomenon that occurs when two nearby cyclonic vortices move around each other and close the distance between the circulations of their corresponding low-pressure areas. The effect is named after Sakuhei Fujiwhara, the Japanese meteorologist who initially described the effect. Binary interaction of smaller circulations can cause the development of a larger cyclone, or cause two cyclones to merge into one. Extratropical cyclones typically engage in binary interaction when within 2,000 kilometres (1,200 mi) of one another, while tropical cyclones typically interact within 1,400 kilometres (870 mi) of each other.