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And there are some numeric models -- and I'm going to go way into the future right now -- that suggest that Melor and Parma may do what is called the Fujiwhara effect, which is they run -- they roll or turn around each other.
Mr Davidson said the two tropical systems were rotating or orbiting each other, called the Fujiwhara effect.
The Fujiwhara Effect: Typhoon Parma and Typhoon Melor