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What is the Fujiwhara Effect?

Nov. 26, 2025

Two cyclonic storms are predicted to form in the Bay of Bengal, with a potential Fujiwhara interaction.

About Fujiwhara Effect:

  • The Fujiwhara Effect (also named as the Fujiwhara interaction or the binary interaction) occurs when two nearby cyclones or hurricanes interact with each other.
  • It was first described by a Japanese meteorologist, Dr. Sakuhei Fujiwhara, in 1921. The phenomenon was thus named after him.
  • What Happens During The Fujiwhara Effect?
    • During the Fujiwhara interaction, the centers of the two cyclones involved in the phenomenon begin to mutually orbit in a counterclockwise direction about a point between the two cyclones.
    • The position of the point is dependent on the intensity and relative mass of the cyclonic vortices.
    • The smaller cyclone involved in the Fujiwhara Effect moves at a faster rate than the bigger one about the central point.
    • The Fujiwhara Effect might lead the two cyclones to spiral into the central point and merge with each other, or it might trigger the development of a larger cyclone.
    • The effect might also divert the original path of one or both the cyclones.

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