Fujiwhara Effect displayed by two vorticies during the formation phase of the Sikeston, Missouri EF3 on May 16, 2025. The Fujiwhara effect, sometimes referred to as the Fujiwhara 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. Bin